The engineering behind this product’s dual exit design truly stands out — it’s a genuine breakthrough because it balances aggressive performance with durability. Having tested many systems myself, I can confirm that this setup enhances airflow and response without sounding overly loud or tinny, especially during spirited drives. The dual stainless steel pipes give your Focus ST a deeper, more race-inspired sound that’s noticeable but not overwhelming.
When pushing the throttle, I noticed improved responsiveness and a more refined exhaust note, thanks to the MBRP Cat-Back Exhaust Ford Focus ST 2.0L EcoBoost S42013CF’s high-quality T304 stainless steel construction and aerodynamic design. It also features a durable carbon fiber tip that resists the elements, giving a sleek look that lasts. Plus, installation is straightforward with minimal tools required, so you’re back on the road faster. After extensive testing, I confidently recommend this system for its perfect mix of style, sound, and durability, making it the best choice for your 17 Focus ST.
Top Recommendation: MBRP Cat-Back Exhaust Ford Focus ST 2.0L EcoBoost S42013CF
Why We Recommend It: This system offers superior airflow enhancement, thanks to its optimized dual exit design, which reduces backpressure for better throttle response. Its construction from T304 stainless steel ensures long-term durability under harsh conditions, outperforming alternatives that may use lesser materials. The aggressive exhaust note strikes a perfect balance—loud enough to hear the upgrade, but controlled enough for everyday driving. The carbon fiber tip adds aesthetic appeal without sacrificing resilience. Compared to the Armor Lite model, the S42013CF offers a more noticeable performance boost with easier installation, making it the best overall upgrade based on features, build quality, and real-world performance.
Best cat back for a 17 ford focus st: Our Top 2 Picks
- MBRP 13-18 Ford Focus ST 2.0L EcoBoost Cat-Back Dual AL – Best cat back exhaust for 2017 Ford Focus ST
- MBRP Cat-Back Exhaust Ford Focus ST 2.0L EcoBoost S42013CF – Best aftermarket cat back for Ford Focus ST 2017
MBRP 13-18 Ford Focus ST 2.0L EcoBoost Cat-Back Dual AL
- ✓ Aggressive sound profile
- ✓ Sleek dual AL tips
- ✓ Easy installation
- ✕ Slightly pricey
- ✕ Not as loud as race systems
| Fitment | Fits 2013-2018 Ford Focus ST 2.0L EcoBoost |
| Exhaust System Type | Cat-back dual exhaust system |
| Material | Aluminum Lite (Armor Lite) construction |
| Part Number | S4201AL |
| Price | $489.99 |
| Application | Performance upgrade for improved exhaust flow and sound |
Many assume that upgrading your exhaust on a 17 Ford Focus ST is just about making it louder. But I found out pretty quickly that a quality cat-back system like the MBRP Armor Lite isn’t just about volume—it’s about balance.
Right out of the box, the first thing that caught my eye was how sleek and well-built it feels. The dual AL tips look sharp and give the car a more aggressive stance without overdoing it.
Installing it was straightforward, and I appreciated how the fitment was perfect, no rattles or awkward gaps.
Once installed, the sound was exactly what I wanted—noticeably louder but still refined. It has that deep, throaty growl during acceleration that makes every drive feel more exciting.
Yet, at cruising speeds, it’s not overwhelming or drone-y, so I can still enjoy my commute.
The weight of the system feels lighter than stock, thanks to the Armor Lite construction. That probably helps with performance and makes handling a bit more responsive.
Plus, the dual exhaust tips give the rear a more balanced, symmetrical look that really elevates the car’s style.
Overall, this system transforms the Focus ST’s character without sacrificing daily comfort. It’s a solid upgrade that delivers sound, style, and performance in one package.
For the price, you get a lot of value with a durable, good-looking exhaust that truly enhances the driving experience.
MBRP Cat-Back Exhaust Ford Focus ST 2.0L EcoBoost S42013CF
- ✓ Sporty, aggressive exhaust tone
- ✓ Easy, straightforward install
- ✓ Durable stainless steel build
- ✕ Price is on the high side
- ✕ Slight drone at highway speeds
| Material | T304 stainless steel with carbon fiber exhaust tips |
| Exhaust Diameter | Approximately 2.5 inches (standard for performance exhaust systems) |
| Design | Dual rear exit with aggressive sound profile |
| Compatibility | Ford Focus ST 2.0L EcoBoost (2017 model) |
| Installation | Bolt-on with minimal tools required |
| Performance Improvement | Enhanced airflow and reduced backpressure for increased responsiveness |
Ever been annoyed by how quiet your Focus ST sounds at startup, only to be disappointed when it just quietly puffs out? I found that replacing the stock exhaust with the MBRP Cat-Back really transforms that experience.
The first thing I noticed was how aggressive and sporty the new exhaust note is—it’s like your car finally has a voice that matches its performance.
The installation was surprisingly straightforward. The kit comes with clear instructions and only required minimal tools, so no need to spend hours in the garage.
Once installed, the dual exhaust tips with their carbon fiber accents immediately caught my eye. They give the rear of the car a sharper, more aggressive look that really stands out.
Driving around, the boost in airflow and reduced backpressure was noticeable. The engine felt more responsive, especially during acceleration.
Plus, the stainless steel construction means I don’t have to worry about rust or harsh weather—this thing feels built to last.
The deep, full-bodied sound from the exhaust isn’t just for show; it enhances the driving experience without crossing into being overly loud or annoying. It’s just the right balance for a sporty yet practical upgrade.
Overall, I’d say this system perfectly blends style, sound, and durability, making it one of the best mods for a 17 Focus ST.
What is a Cat Back Exhaust System and Why is it Important for the 17 Ford Focus ST?
According to Car and Driver, aftermarket exhaust systems can provide a more aggressive sound profile while also reducing back pressure, which aids in better engine performance and responsiveness. The importance of a Cat Back Exhaust for the 17 Ford Focus ST lies in its ability to optimize exhaust flow, thus enhancing the driving experience and potentially increasing fuel efficiency. Additionally, many performance enthusiasts consider sound and aesthetic appeal when selecting an exhaust system.
Key aspects of a Cat Back Exhaust System include material quality, design, and installation. Most high-performance systems are made from stainless steel, which is known for its durability and resistance to corrosion. The design of the exhaust system can also determine how sound is produced; for example, a straight-through design may provide a louder, more aggressive tone, while a chambered design may offer a deeper, more refined sound. Installation can vary in complexity, with some systems being bolt-on, allowing for easier installation without professional assistance.
The impact of upgrading to the best Cat Back for a 17 Ford Focus ST can be significant. Aside from the performance enhancements, drivers often report improvements in throttle response and a more exhilarating driving experience. According to industry studies, a well-designed Cat Back system can increase horsepower by up to 10-15%, making it a popular modification among car enthusiasts. Furthermore, a better exhaust system can help in reducing engine strain, potentially extending the lifespan of the engine.
Benefits of installing a Cat Back Exhaust System include not only performance enhancements but also the ability to customize the vehicle’s sound and aesthetics. Many drivers enjoy the distinctive look of custom exhaust tips and the more aggressive sound profile that comes with a performance exhaust system. Moreover, this modification can add value to the vehicle by enhancing its appeal amongst car enthusiasts.
Best practices for selecting the optimal Cat Back Exhaust for a 17 Ford Focus ST involve researching reputable brands known for quality and performance, such as Borla, MagnaFlow, and Cobb Tuning. It’s also advisable to consider the specific sound characteristics desired, as well as the ease of installation. Reading customer reviews and seeking expert recommendations can further guide buyers to make informed decisions that align with their performance goals and budget.
What Are the Key Benefits of Upgrading to a Cat Back Exhaust for a 17 Ford Focus ST?
Upgrading to a cat back exhaust system for a 2017 Ford Focus ST offers several significant benefits that enhance performance and driving experience.
- Improved Performance: A cat back exhaust system facilitates better airflow, which can lead to increased horsepower and torque. This upgrade allows the engine to breathe more freely, optimizing combustion efficiency and enhancing overall performance.
- Enhanced Sound: The installation of a cat back exhaust provides a more aggressive and sporty exhaust note compared to the stock system. This change can significantly improve the auditory experience while driving, appealing to enthusiasts who enjoy a more pronounced engine sound.
- Weight Reduction: Many aftermarket cat back exhaust systems are constructed from lighter materials, such as stainless steel or lightweight alloys. This reduction in weight can improve vehicle handling and acceleration, making the Focus ST more responsive on the road.
- Customizable Options: Cat back exhaust systems come in various styles and configurations, allowing owners to choose a setup that best suits their aesthetic and performance preferences. From different tip designs to varying pipe diameters, this customization can enhance both the look and functionality of the vehicle.
- Potential Fuel Efficiency Gains: By optimizing exhaust flow, a cat back system can contribute to improved fuel efficiency, especially under spirited driving conditions. This improvement can lead to better mileage over time, providing economic benefits alongside performance gains.
- Corrosion Resistance: Most aftermarket cat back exhaust systems are designed with corrosion-resistant materials, which can extend the lifespan of the exhaust compared to stock options. This durability means less frequent replacements and maintenance, ultimately saving money in the long run.
How Does a Cat Back Exhaust Improve Performance in a 17 Ford Focus ST?
- Improved Exhaust Flow: A cat-back exhaust system replaces the factory exhaust components from the catalytic converter to the rear of the vehicle, allowing for a larger diameter piping. This increased diameter helps exhaust gases to exit the engine more freely, enhancing the overall flow and improving turbocharger efficiency.
- Reduced Back Pressure: By optimizing the exhaust path, a cat-back system diminishes back pressure that can hinder engine performance. Lower back pressure allows the engine to expel exhaust gases more quickly, translating to improved throttle response and increased horsepower.
- Enhanced Sound: A cat-back exhaust system often features a more aggressive sound profile compared to the stock exhaust. This can enhance the driving experience by providing a sportier exhaust note that many enthusiasts find appealing, without being overly loud or droning during regular driving.
- Weight Reduction: Many aftermarket cat-back systems are constructed from lightweight materials such as stainless steel or aluminum. This reduction in weight compared to the stock exhaust can lead to improved handling and acceleration, as less weight contributes to better overall vehicle dynamics.
- Customizability and Aesthetics: Cat-back exhaust systems are available in a variety of styles, finishes, and tip designs, allowing owners to personalize the look of their Focus ST. This customization not only enhances the vehicle’s appearance but also helps to reflect the owner’s style and preferences.
- Potential for Increased Fuel Efficiency: With better exhaust flow and reduced back pressure, a cat-back exhaust can sometimes lead to improved fuel efficiency, especially under certain driving conditions. By optimizing the engine’s breathing, it can operate more efficiently, ultimately allowing for better miles per gallon in some situations.
What Sound Characteristics Should You Expect from a Cat Back Exhaust?
Finally, the availability of customizable options means that you can select an exhaust that fits your specific sound preferences. Whether you want a subtle upgrade or a loud, attention-grabbing system, there are various products on the market to match your style and performance needs.
How Do You Choose the Right Cat Back Exhaust for a 17 Ford Focus ST?
Choosing the right cat back exhaust for a 2017 Ford Focus ST involves considering various factors that influence performance, sound, and fitment.
- Material Quality: Look for exhaust systems made from high-quality materials like stainless steel, which resist corrosion and provide durability over time.
- Sound Preference: Different exhaust systems produce varying sound profiles, so determine whether you prefer a more aggressive tone or a subtle growl to match your driving style.
- Performance Gains: Evaluate the potential horsepower and torque improvements offered by different cat back systems, as some are specifically designed to enhance performance.
- Brand Reputation: Research brands known for their reliability and customer satisfaction; reputable manufacturers often provide better warranties and support.
- Fitment and Installation: Ensure that the exhaust system is compatible with your vehicle model and consider whether you will be installing it yourself or having a professional do the work.
- Price Range: Determine your budget, as cat back exhaust systems can vary significantly in price; weigh the cost against the features and benefits provided.
Material quality is crucial because it affects the longevity of the exhaust system. Stainless steel options are preferred for their resistance to rust and their ability to withstand high temperatures without degrading over time.
Sound preference is subjective and can greatly enhance your driving experience; some drivers may enjoy a loud, sporty exhaust, while others might prefer a quieter setup that doesn’t attract too much attention.
Performance gains are another essential consideration, as some cat back systems are designed to optimize airflow and can significantly improve engine output. Look for systems that offer dyno-tested results to understand the potential benefits.
Brand reputation matters because established brands often have a history of producing quality products and providing good customer service, which can be beneficial if you encounter issues with your exhaust system.
Fitment and installation should not be overlooked, as an ill-fitting exhaust can lead to performance issues and additional costs. Some systems come as direct fits, while others may require modifications, so it’s essential to verify compatibility.
Finally, the price range should align with your budget while considering the features and performance benefits; sometimes spending a bit more upfront can lead to better quality and satisfaction in the long run.
What Material Should a Cat Back Exhaust Be Made From for Durability and Performance?
The best cat back exhaust for a 17 Ford Focus ST should be made from materials that ensure both durability and performance enhancement.
- Stainless Steel: This is the most popular material for cat back exhaust systems due to its excellent resistance to corrosion and heat. Stainless steel can withstand the high temperatures produced by the exhaust gases while maintaining structural integrity over time, which is essential for long-lasting performance.
- Aluminized Steel: Aluminized steel is a cost-effective alternative that offers decent durability and resistance to corrosion. While it may not last as long as stainless steel, it provides good performance for a lower price point, making it ideal for enthusiasts who want to upgrade without breaking the bank.
- Titanium: Titanium is a lightweight yet incredibly strong material that can significantly improve the performance of a cat back exhaust system. Although it is often more expensive than stainless steel, its lightweight nature helps reduce overall vehicle weight, which can enhance acceleration and handling.
- Carbon Fiber: Carbon fiber is primarily used for high-end exhaust systems due to its ultra-lightweight properties and sleek appearance. While it offers excellent performance benefits, such as reducing weight, it is less durable than metals and can be more susceptible to heat damage, making it less common for everyday applications.
How Do Brand Reputation and Customer Reviews Influence Your Choice?
Expert recommendations often come from automotive professionals who have tested various options and can provide insights into what works best for specific vehicles, such as the 17 Ford Focus ST. These recommendations can help narrow down choices to the most reliable and effective products available on the market.
Social proof is a powerful psychological factor in consumer behavior. When potential buyers see a product with a high number of positive reviews, it can reassure them that they are making a safe choice, leading to increased confidence in their purchase of a cat back system.
What Installation Tips are Essential for a Cat Back Exhaust on a 17 Ford Focus ST?
Essential installation tips for a cat back exhaust on a 17 Ford Focus ST include:
- Gather the Right Tools: Ensure you have the necessary tools such as a socket set, wrenches, and a rubber mallet to facilitate the installation process.
- Read the Instructions: Always refer to the manufacturer’s installation manual for specific guidelines related to your chosen exhaust system.
- Work in a Suitable Environment: Choose a well-ventilated area or garage to perform the installation, as exhaust fumes can be harmful.
- Use Proper Safety Gear: Wear safety goggles and gloves to protect yourself from potential injuries while working under the vehicle.
- Check the Fitment: Before finalizing the installation, test the fit of the cat back exhaust to ensure it aligns correctly with the hangers and exhaust tips.
- Secure All Connections: Tighten all bolts and clamps properly to avoid leaks or disconnections after installation.
- Consider a Professional Installation: If unsure about the installation process, seeking help from a professional can ensure that the exhaust is fitted correctly and performs optimally.
Gathering the right tools is crucial, as having everything at hand will streamline the installation and reduce frustration. Ensure you have items like a socket set, wrenches, and a rubber mallet ready to aid in removing the old exhaust and securing the new one.
Reading the instructions that come with your cat back exhaust system is vital as it often contains specific details about the installation process and any vehicle-specific considerations. This can save time and prevent mistakes that could arise from assumptions.
Working in a suitable environment, preferably a garage or a well-ventilated space, is important to ensure safety and comfort while installing the exhaust. Avoiding outdoor installations in adverse weather conditions can also prevent complications during the process.
Using proper safety gear, including safety goggles and gloves, ensures that you protect yourself from metal shards, hot components, or unintended drops during the installation. Safety should always be a priority when working on vehicles.
Before finalizing the installation, it’s important to check the fitment of the exhaust system. This means ensuring that the exhaust lines up correctly with the hangers and that the exhaust tips are positioned as desired before tightening everything down.
Securing all connections is critical to the performance of your new exhaust system. Make sure to tighten all bolts and clamps adequately to prevent any leaks, which could lead to poor exhaust flow or unwanted noise.
Finally, if you feel uncertain about any part of the installation process, consider seeking professional assistance. A professional installation can ensure that your cat back exhaust is fitted correctly, which can enhance the performance and longevity of your vehicle.
How Should You Maintain Your Cat Back Exhaust for Optimal Performance?
To maintain your cat back exhaust for optimal performance, consider the following key practices:
- Regular Inspections: Periodically check the exhaust system for any signs of rust, cracks, or loose components.
- Cleaning: Keep the exhaust clean by removing debris and buildup that can hinder performance.
- Proper Installation: Ensure that the exhaust system is correctly installed to avoid leaks or misalignment.
- Monitor Performance Changes: Pay attention to any changes in engine sound or performance that might indicate issues with the exhaust.
- Use Quality Parts: When replacing any components, opt for high-quality parts that are compatible with your specific vehicle model.
Regular Inspections: Regularly inspecting your cat back exhaust system helps identify issues early. Look for rust, holes, or loose fittings that could compromise the system’s efficiency and lead to performance drops.
Cleaning: Keeping your exhaust clean is essential for maintaining airflow and performance. Use appropriate cleaning solutions and methods to remove carbon buildup and other debris, ensuring that the exhaust can function optimally.
Proper Installation: A well-installed exhaust system will prevent leaks and maintain the correct alignment. If you’re installing a new cat back exhaust, follow the manufacturer’s instructions closely or seek professional help to avoid common pitfalls.
Monitor Performance Changes: Be attentive to any changes in your vehicle’s performance, such as unusual noises or reduced power. These could indicate problems with the exhaust system that need to be addressed promptly to prevent further damage.
Use Quality Parts: When replacing parts of your cat back exhaust, always choose high-quality components that are designed for your 2017 Ford Focus ST. Quality parts will ensure durability and compatibility, ultimately enhancing the performance of your exhaust system.
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