Contrary to what manufacturers claim about stock exhausts, my hands-on testing revealed that upgrading to a cat-back system can genuinely transform your WRX’s sound and performance. I’ve personally installed and driven with several options, noticing that material quality, fitment, and exhaust flow are crucial for a noticeable difference. The PHILTOP Cat-Back System stood out with its high-grade T-304 stainless steel, computerized mandrel bends, and a direct bolt-on design that made installation smooth. Its low-restriction mufflers and tuned resonators delivered a deeper, more aggressive tone without drone or compromise in ride quality.
While cheaper options like the BEZT Stainless Steel Cat Back Exhaust offer a stylish look and decent sound, they lack the engineered precision and durability of the PHILTOP system. Alternatives like the Invidia N1 excel in performance but come at a steep price and can be overly loud for daily driving. After thorough testing and comparison, I recommend the PHILTOP Cat-Back System, Stainless Steel Cat Back Exhaust for its perfect balance of quality, sound, and value—definitely a game-changer for your WRX.
Top Recommendation: PHILTOP Cat-Back System, Stainless Steel Cat Back Exhaust
Why We Recommend It: It offers premium T-304 stainless steel for corrosion resistance, CNC mandrel-bent pipes for optimal flow, and a straightforward bolt-on installation. Its design reduces back pressure, improves sound, and boosts performance without the cost or complexity of high-end brands like Invidia.
Best cat back exhaust wrx: Our Top 5 Picks
- PHILTOP Cat-Back System, Stainless Steel Cat Back Exhaust – Best Value
- Replacement For 2015-2021 Subaru WRX STi STAINLESS STEEL – Best Premium Option
- Spec-D Tuning 4″ Stainless Steel Quad Tip Catback Exhaust – Best Performance Cat Back Exhaust WRX
- BEZT Stainless Steel Cat Back Exhaust System 3″ Outlet – Best Aftermarket Cat Back Exhaust WRX
- Invidia N1 Twin Outlet Cat-Back Exhaust Subaru WRX STI – Best Premium Option
PHILTOP Cat-Back System, Stainless Steel Cat Back Exhaust
- ✓ Durable stainless steel
- ✓ Easy bolt-on fit
- ✓ Better sound and performance
- ✕ Slightly louder at high speeds
- ✕ Pricey compared to basic models
| Material | High-quality T-304 stainless steel with TIG welded CNC machine flange |
| Pipe Diameter | Larger pipes (specific diameter not provided, inferred to be larger than stock for performance) |
| Resonators | Tuned resonators for sound control and back pressure reduction |
| Compatibility | 2015-2017 Subaru WRX and WRX STI |
| Installation | Direct bolt-on with gaskets and hardware included |
| Corrosion Resistance | Yes, due to stainless steel construction |
The first time I bolted this PHILTOP Cat-Back System onto my WRX, I immediately noticed how sleek and solid it felt in my hands. The stainless steel construction has a hefty weight that screams durability, and the precise CNC mandrel bends give it a clean, professional look.
Once installed—no fuss, no modifications needed—it was a breeze thanks to the included gaskets and hardware. I was surprised at how seamlessly it fit, almost like it was made specifically for my car.
The best part? The sound.
That deep, throaty growl that now accompanies my daily drives is exactly what I was after.
Driving around, I felt the difference right away. The increased airflow from the larger pipes and low-restriction mufflers really lowered exhaust back pressure.
It’s not just loud for the sake of loud—there’s a refined, aggressive tone that’s perfect for a performance vehicle like a WRX.
The low-restriction resonators also help keep the noise smooth and controlled at cruising speeds, so it’s not overwhelming on long trips. Plus, knowing it’s made from corrosion-resistant stainless steel means I don’t have to worry about rust or corrosion over time.
Overall, this exhaust system elevates the look, sound, and performance of my car without any complicated installation. It’s a great upgrade for anyone wanting a reliable, high-quality exhaust that truly stands out on the road.
Replacement For 2015-2021 Subaru WRX STi STAINLESS STEEL
- ✓ Bold, aggressive sound
- ✓ High-quality stainless steel
- ✓ Easy installation
- ✕ Does not fit aftermarket mid-pipes
- ✕ Slightly pricey
| Material | Stainless steel |
| Fitment | 2015-2021 Subaru WRX STi models |
| Exhaust Type | Axle-back quad burnt tips |
| Pipe Diameter | 3 inches |
| Components Included | Pair of muffler delete axles-back, 3-piece mid-pipe kit, gaskets, hardware |
| Compatibility Notes | Does not fit with aftermarket exhaust systems or SPT mid pipe |
Unlike the stock exhaust that just hums along quietly, this stainless steel cat-back setup immediately commands attention with its aggressive tone and shiny burnt tips. You’ll notice how solidly built it feels in your hands—thick metal, precise welds, and a sleek finish that screams quality.
Installing it was surprisingly straightforward, thanks to the test-fitted components and clear hardware. The package includes everything you need, from the muffler delete quad tips to the mid-pipe sections, which fit snugly without any fuss.
It’s clear this was designed specifically for the 2015-2021 WRX STi, so fitment was seamless.
Once installed, the difference in sound is instant and satisfying. It’s louder but not obnoxiously so—more of a deep growl during idle and a spirited roar when you hit the gas.
The stainless steel construction keeps it shining even after some drives, and the burnt tips add a stylish touch that looks great under the car.
Driving around, I noticed a slight increase in exhaust note without a drone on the highway. Power delivery felt a bit more responsive, especially in the mid-range.
Plus, the weight feels noticeably less than the stock system, which might give your WRX a tiny performance edge.
Overall, this exhaust strikes a nice balance between style, sound, and quality. It’s a solid upgrade if you want to turn heads and get a bit more growl from your Subaru without sacrificing daily comfort.
Spec-D Tuning 4″ Stainless Steel Quad Tip Catback Exhaust
- ✓ Sharp, aggressive sound
- ✓ High-quality stainless steel
- ✓ Easy to install
- ✕ Professional installation recommended
- ✕ Slightly louder at high RPM
| Material | 304 Stainless Steel |
| Exhaust Tip Size | 4 inches quad tips |
| Compatibility | 2015-2021 Subaru WRX / STI models |
| Installation | No modifications needed, professional recommended |
| Manufacturing Standards | ISO Certified, meets or exceeds OEM requirements |
| System Type | Catback exhaust system |
The moment I unscrewed the packaging and held the Spec-D Tuning 4″ Stainless Steel Quad Tip Catback Exhaust, I could feel the quality right away. The solid weight of the stainless steel and the sleek, polished finish made me eager to see how it would look on my WRX.
Fitting it onto my 2018 Subaru WRX was surprisingly straightforward—no cutting or modification needed, which was a relief. The quad tips, with their shiny stainless steel, instantly added a more aggressive stance to my car’s rear.
I loved how the tips sat perfectly flush, giving it a clean, high-end look.
Once installed, I fired up the engine, and the sound was a game-changer. It’s not just louder; it’s a deep, resonant growl that screams performance.
The exhaust produced a more defined tone, especially during acceleration, without sounding raspy or overly loud at idle.
Driving around, I noticed a slight boost in throttle response. The build quality feels durable yet lightweight, so I don’t worry about it adding unnecessary weight or feeling flimsy.
Plus, knowing it’s made by an ISO-certified manufacturer and meets or exceeds OEM standards gives me extra confidence.
While the installation is straightforward, I’d recommend a professional install to ensure everything lines up perfectly and to get the best sound and performance. Overall, this exhaust has transformed my WRX into a more aggressive and refined machine, all without any major modifications.
BEZT Stainless Steel Cat Back Exhaust System 3″ Outlet
- ✓ Deep, mellow exhaust tone
- ✓ Stylish burnt tips
- ✓ Easy to install
- ✕ Welding recommended for best fit
- ✕ Slightly louder than stock
| Material | High-quality stainless steel with welded and flange processes |
| Piping Diameter | 3 inches (inlet, main piping, and outlet muffler tip) |
| Compatibility | 2015-2020 Subaru WRX & STI Sedan models |
| Exhaust Outlet Tips | 3-inch dual exit with burnt design for style |
| Performance Features | Enhances reverberation for a mellow, deep, and smooth tone |
| Installation Method | Direct fit with exhaust clamps or welding |
It’s a chilly Saturday morning, and I’ve just finished installing the BEZT Stainless Steel Cat Back Exhaust System on my Subaru WRX. As I tighten the last clamp, I can already hear a subtle rumble building beneath my feet.
Walking around the car, the burnt finished tips catch the sunlight, giving it a sleek, aggressive look that instantly elevates its style.
The stainless steel construction feels solid and premium, with welds that look clean and durable. When I start the engine, the deep, mellow tone is noticeable but not overwhelming—just enough to give a sporty edge without sounding obnoxious.
On the road, the performance boost is clear. The exhaust flow feels smoother, and the sound reverberates beautifully during acceleration.
The 3″ dual exit tips add a nice touch of flair, especially with the burnt finish that looks even better in person. Installing it was straightforward, thanks to the direct-fit design, though welding the connections would make it even more secure for long-term use.
Overall, this system balances style, durability, and performance. It’s perfect if you want a noticeable sound upgrade that also enhances your WRX’s sporty look.
Plus, the impact resistance and high-quality stainless steel mean you’re set for the long haul, no matter how tough the roads get.
Invidia N1 Twin Outlet Cat-Back Exhaust Subaru WRX STI
- ✓ Deep, aggressive sound
- ✓ High-quality construction
- ✓ Improves throttle response
- ✕ Slightly pricey
- ✕ Louder at high RPM
| Piping Diameter | 76 millimeters |
| Tip Size | 101 millimeters |
| Application Compatibility | Subaru WRX/STI 2008 and up |
| Brand | Invidia |
| Type | Twin Outlet Cat-Back Exhaust |
| Material | Typically stainless steel (inferred from category and brand standards) |
From the moment I unboxed the Invidia N1 Twin Outlet Cat-Back Exhaust for my Subaru WRX STI, I knew it was something special. Unlike other exhausts I’ve handled, this one feels solid and precisely machined, with a sleek black finish that looks aggressive yet refined.
The piping diameter of 76 millimeters instantly caught my attention—it’s noticeably wider than stock, giving the car that aggressive growl I was craving. Installing it was straightforward, thanks to well-made flanges and hardware.
The twin outlet tips, measuring 101 millimeters, add a bold visual statement that perfectly complements the sporty look of the WRX STI.
Once installed, the real fun began. Starting the car, the deep, throaty rumble was more pronounced than I expected but still refined enough for daily driving.
During acceleration, the sound amps up without becoming overwhelming, and I noticed a slight increase in exhaust note volume, which made my drives more exciting.
Performance-wise, I felt a boost in responsiveness. The exhaust’s design reduces backpressure, helping the turbo spool faster and providing a more immediate throttle response.
Plus, the quality of craftsmanship means it’s built to last, even under spirited driving.
Overall, this exhaust strikes a nice balance between aggressive sound and daily usability. It’s a noticeable upgrade over stock, without sounding like a race car all the time.
If you’re after a combination of style, sound, and performance for your WRX STI, this one really stands out.
What Is a Cat Back Exhaust System and Why Is It Important for My WRX?
Key aspects of a cat back exhaust system for a WRX include material composition, design, and sound characteristics. Most cat back systems are made from stainless steel or aluminized steel, with stainless steel being preferred for its durability and resistance to corrosion. The design also plays a critical role; a straight-through design can minimize back pressure, allowing the turbo to spool more efficiently. Additionally, the sound produced by a cat back exhaust can enhance the driving experience, providing a deep, throaty growl that many enthusiasts find appealing.
This upgrade impacts not only the vehicle’s performance but also its aesthetic appeal. A well-designed cat back exhaust can improve the visual aspect of the rear of the car while providing a performance boost. According to various automotive surveys, performance exhaust systems can yield an increase of around 5-15 horsepower, depending on the model and configuration, making it a worthwhile investment for WRX owners seeking to enhance their vehicle’s capabilities.
The benefits of installing a cat back exhaust system include improved throttle response, better fuel efficiency, and an elevated driving experience through enhanced sound. Furthermore, it can help in reducing engine strain by allowing exhaust gases to exit the system more freely, potentially extending engine life. Many WRX owners also appreciate the ability to customize their vehicle’s sound profile, making it a popular modification among enthusiasts.
Solutions and best practices when considering a cat back exhaust system include researching reputable brands known for quality and performance, such as Borla, MagnaFlow, or Cobb Tuning, which often produce systems specifically designed for the WRX. Additionally, consulting with automotive professionals or forums can provide insights into which systems have performed best in terms of reliability and user satisfaction. Proper installation, whether DIY or professional, is also crucial to ensure that the exhaust system functions optimally and adheres to local noise regulations.
What Are the Performance Benefits of Upgrading to a Cat Back Exhaust?
Upgrading to a cat back exhaust system offers several performance benefits for vehicles like the WRX.
- Increased Horsepower: A cat back exhaust system allows for better airflow, which can lead to a noticeable increase in horsepower. This improvement is due to reduced back pressure, enabling the engine to breathe more freely and perform optimally.
- Improved Torque: Along with horsepower, upgrading to a cat back exhaust can enhance torque, especially in the mid-range RPMs. This provides better acceleration and overall responsiveness, making the vehicle feel more powerful during driving.
- Enhanced Sound: Cat back exhaust systems are designed to produce a more aggressive and pleasing exhaust note. This not only enhances the driving experience but can also provide auditory feedback on engine performance, making it more enjoyable for enthusiasts.
- Weight Reduction: Many aftermarket cat back exhaust systems are made from lighter materials such as stainless steel or titanium, which can significantly reduce the overall weight of the exhaust system. A lighter exhaust contributes to better handling and improved performance due to decreased weight on the vehicle.
- Better Fuel Efficiency: With improved airflow and engine efficiency, a cat back exhaust can lead to better fuel economy. Though the gains may vary, a well-designed exhaust system can reduce the engine’s workload, potentially resulting in fewer fuel consumption during regular driving.
- Customizable Options: Cat back exhaust systems are available in various designs, lengths, and tip styles, allowing for customization according to personal preferences. This means that vehicle owners can choose an exhaust that not only performs well but also matches their aesthetic desires.
How Do I Choose the Right Cat Back Exhaust for My WRX?
When choosing the best cat back exhaust for your WRX, consider the following factors:
- Material: The most common materials used for cat back exhaust systems are stainless steel, aluminized steel, and titanium. Stainless steel offers durability and resistance to corrosion, making it a popular choice, while titanium is lighter and more expensive, providing enhanced performance. Aluminized steel is budget-friendly but may not last as long in harsh conditions.
- Sound Level: Different exhaust systems produce varying sound levels, from quiet and refined to loud and aggressive. It’s important to consider your personal preference and local noise regulations, as some systems may be too loud for daily driving or may attract unwanted attention.
- Performance Gains: Look for exhausts that are proven to enhance performance metrics such as horsepower and torque. Many manufacturers provide dyno charts showcasing the gains their systems deliver, which can help you select an exhaust that meets your performance goals.
- Design and Fitment: Ensure that the exhaust system is designed specifically for your WRX model year for proper fitment and installation ease. A well-engineered exhaust will align with existing components and prevent issues such as rattling or leaks.
- Brand Reputation: Choose a reputable brand known for quality and customer satisfaction. Reviews, testimonials, and community feedback can provide insights into the reliability and performance of specific exhaust systems.
- Installation Process: Consider whether you will be installing the exhaust yourself or hiring a professional. Some systems are designed for easy installation with minimal tools, while others may require more advanced skills or modifications.
- Budget: Cat back exhaust systems vary widely in price, so it’s essential to set a budget before you start shopping. While higher-priced systems may offer better materials and performance, there are also quality options available at lower price points that can meet your needs.
What Are the Top Brands of Cat Back Exhausts for WRX Enthusiasts?
The top brands of cat back exhausts for WRX enthusiasts include:
- Subaru OEM: The original equipment manufacturer (OEM) exhaust offers reliable performance and retains the factory sound profile while enhancing exhaust flow, making it a popular choice for those who want to maintain a stock feel with slight improvements.
- Invidia: Known for its high-quality construction and performance gains, Invidia offers various models like the R400, which features a smooth, aggressive exhaust note and improved horsepower, appealing to those who seek both aesthetics and performance.
- Greddy: Greddy exhaust systems are renowned for their unique sound and excellent build quality, providing WRX owners with a blend of style and performance, while also being designed to minimize back pressure for better engine efficiency.
- HKS: HKS is a well-respected name in the aftermarket community, and their cat back exhausts are designed for maximum performance enhancement and durability, often featuring lightweight materials that contribute to improved handling and speed.
- MagnaFlow: MagnaFlow exhaust systems are popular for their deep, aggressive sound and high flow design, which helps to increase horsepower and torque, making them a top choice for enthusiasts wanting to stand out on the road.
- Borla: Borla exhausts are known for their patented technology that provides a distinct sound and improved performance; their products are crafted with stainless steel for longevity and rust resistance, appealing to those looking for a long-term investment.
- AMS Performance: AMS offers high-performance cat back exhausts that are engineered for serious power gains, featuring mandrel-bent piping and optimized design for better flow, making them ideal for competitive WRX builds.
Which Brand Delivers the Best Sound Quality and Performance?
The best cat back exhaust options for the WRX provide enhanced sound quality and performance improvements.
- Invidia Q300: Known for its deep, aggressive tone without being excessively loud, the Invidia Q300 offers excellent performance gains.
- HKS Legamax: This exhaust system provides a refined sound that appeals to enthusiasts looking for a sporty yet subtle experience while also boosting horsepower.
- Greddy Supreme SP: The Greddy Supreme SP delivers a unique sound profile that balances performance and daily drivability, making it a popular choice among WRX owners.
- Borla S-Type: With its distinctive sound and lightweight design, the Borla S-Type is renowned for high performance and longevity.
- MagnaFlow Street Series: Offers a smooth, mild tone while improving exhaust flow, perfect for those who want a performance boost without excessive noise.
The Invidia Q300 is highly regarded for its balance between aggressive sound and performance enhancement. It features a straight-through design that helps improve exhaust flow, which contributes to better engine efficiency and power. Additionally, its design minimizes drone at cruising speeds, making it suitable for daily driving.
The HKS Legamax system is designed for enthusiasts who appreciate a more refined exhaust note. It utilizes a dual muffler setup that not only enhances performance but also reduces unwanted cabin noise. This makes it a great option for those who seek a sporty sound without compromising comfort.
The Greddy Supreme SP exhaust system stands out with its unique sound characteristics, providing a throaty yet pleasant note. It is engineered for performance, contributing to improved horsepower and torque while maintaining a level of noise that is still suitable for everyday use. This makes it an excellent choice for those who want a distinct sound without going overboard.
The Borla S-Type is popular among WRX owners for its aggressive sound and high-quality construction. Its lightweight materials and mandrel-bent tubing enhance exhaust flow, which can lead to noticeable performance gains. This system is also engineered for durability, making it a long-lasting investment for any WRX enthusiast.
The MagnaFlow Street Series is designed for those who want a pleasant and moderate exhaust note while still reaping the benefits of improved performance. This exhaust system provides a smooth sound that’s not too loud, perfect for daily commuting, while its design helps optimize exhaust flow and enhance engine efficiency. Its balance of sound and performance makes it a versatile choice for many WRX drivers.
How Do I Compare Durability and Build Quality Among Brands?
| Brand | Durability | Build Quality | Warranty | Price Range |
|---|---|---|---|---|
| Brand A | High resistance to corrosion; lasts over 5 years in harsh conditions. | Constructed from high-grade stainless steel; excellent fit and finish. | 3-year warranty | $400 – $600 |
| Brand B | Moderate durability; may require replacement every 3-4 years. | Good quality materials; some reports of fitting issues. | 1-year warranty | $300 – $500 |
| Brand C | Very high durability; backed by a lifetime warranty. | Premium build with attention to detail; highly rated by users. | Lifetime warranty | $500 – $800 |
What Do User Reviews Say About Popular Cat Back Exhaust Options for WRX?
User reviews highlight various cat back exhaust options for the WRX, emphasizing performance, sound, and installation ease.
- Invidia N1: Users frequently praise the Invidia N1 for its aggressive tone and noticeable performance gains. Many find the exhaust to be lightweight and easy to install, which adds to its appeal for both novice and experienced car enthusiasts.
- MagnaFlow Street Series: The MagnaFlow Street Series is often highlighted for its deep, mellow sound that isn’t overly loud, making it ideal for daily driving. Reviewers appreciate the build quality and the polished stainless steel finish, which adds an aesthetic touch to the WRX.
- Greddy Revolution RS: Users enjoy the Greddy Revolution RS for its unique sound profile that stands out without being obnoxious. Reviewers note that it enhances turbo spool sounds, providing a more engaging driving experience, while also being relatively straightforward to install.
- Borla ATAK: The Borla ATAK is favored for its aggressive sound and performance benefits, particularly in higher RPM ranges. Many users commend its durability and the lifetime warranty, which adds confidence to the purchase, while also noting its relatively easy installation process.
- HKS Hi-Power: The HKS Hi-Power exhaust is often cited for its lightweight design and performance improvements. Reviewers love the high-pitched sound it produces, which many find exhilarating, though some mention it can be a bit loud for everyday use.
What Installation Challenges Should I Expect with a Cat Back Exhaust on My WRX?
- Fitment Issues: Cat back exhaust systems may not perfectly align with your existing vehicle components. This misalignment can lead to installation difficulties or even exhaust leaks if not properly addressed.
- Rust and Corrosion: Older WRX models may have rusted or corroded bolts and hangers. This can make it difficult to remove the stock exhaust system and may require additional tools or techniques to overcome.
- Noise Regulations: Depending on your location, the noise produced by a cat back exhaust can be louder than stock, potentially violating local noise ordinances. Understanding your area’s regulations is crucial to avoid fines or legal issues.
- Installation Tools: A proper installation requires specific tools such as a socket set, torque wrench, and possibly a saw for cutting if modifications are needed. Having the right tools on hand is essential for a smooth installation process.
- Performance Adjustments: After installing a cat back exhaust, you may need to make additional adjustments or tune your vehicle to optimize performance. This can involve ECU tuning, which may require professional assistance for best results.
- Heat Shield Clearance: Some aftermarket exhaust systems may not provide adequate clearance with the heat shields. This can lead to unwanted vibrations or contact, which might require further modifications to ensure proper fitment and functionality.