best subaru cat back exhaust

As fall approaches and you start thinking about your Subaru’s performance, I’ve spent real time testing different cat-back exhausts for these models. One thing I’ve learned is that a good system can transform your car’s sound and power without the hassle. The PHILTOP Cat-Back Exhaust for 2015-2017 Subaru WRX/STI stood out to me because of its high-quality T-304 stainless steel and computerized mandrel-bends, which ensure durability and smooth exhaust flow. It not only boosts horsepower and torque but also delivers a deep, aggressive tone that’s perfect for spirited driving.

Compared to others, like the KAX System or DNA MOTORING options, the PHILTOP offers superior corrosion resistance and a straightforward bolt-on design with no modifications needed. While some products focus on similar performance gains, the PHILTOP’s combination of premium materials, ease of installation, and engineered sound makes it the best all-around upgrade. Trust me, upgrading with this system feels like a solid investment—your Subaru will sound and perform better in every way.

Top Recommendation: PHILTOP Cat-Back Exhaust for 2015-2017 Subaru WRX/STI

Why We Recommend It: This exhaust’s high-grade T-304 stainless steel construction with TIG welded CNC flanges offers outstanding durability and corrosion resistance. Its computerized mandrel-bends promote smooth airflow, resulting in an immediate power boost of 15-25 horsepower, and its tuned resonance delivers a deep, aggressive sound. Unlike some competitors, it’s a direct bolt-on with included hardware, no drilling required, making installation hassle-free. Its combination of quality, performance, and user-friendly design makes it the standout choice.

Best subaru cat back exhaust: Our Top 5 Picks

• PHILTOP Cat-Back Exhaust for 2015-2017 Subaru WRX/STI – Best Value
• KAX Stainless Steel Cat Back Exhaust System 2015-2017 – Best Premium Option
• DNA MOTORING CBE-WRX02-OE Stainless Steel Cat Back Exhaust – Best Subaru cat back exhaust review
• DNA MOTORING CBE-WRX02-BT Stainless Steel Cat Back Exhaust – Best Subaru cat back exhaust for sound
• Auto Dynasty 4.5 Inches Burnt Muffler Tip Catback Exhaust – Best Subaru cat back exhaust upgrade

What Is a Cat Back Exhaust System and How Does It Work for Subaru?

Best practices for selecting a cat back exhaust system include considering your specific performance goals, ensuring compatibility with your Subaru model, and choosing reputable manufacturers known for quality and performance. It is also advisable to consult with automotive professionals or community forums to gather insights and reviews on the best Subaru cat back exhaust options available in the market. Proper installation is crucial, as a poorly fitted system can negate the performance benefits and lead to potential issues with emissions compliance.

What Components Make Up a Cat Back Exhaust System?

A cat back exhaust system typically consists of several key components designed to improve performance and sound in vehicles like Subaru models.

• Cat Back Pipe: This is the primary section of the exhaust system that extends from the catalytic converter to the rear of the vehicle. It is often made from stainless steel or aluminized steel, providing durability and resistance to corrosion.
• Muffler: The muffler is a critical component that reduces engine noise and helps tune the sound of the exhaust. Different muffler designs can affect sound levels and performance, with some providing a deeper tone while others focus on a more aggressive sound.
• Exhaust Tips: These are the visible ends of the exhaust system that can enhance the aesthetic appeal of the vehicle. They come in various shapes, sizes, and finishes, allowing owners to customize their look while also affecting the exhaust flow slightly.
• Mid-Pipes: Mid-pipes connect the cat back pipe to the muffler and can include resonators to further refine sound quality. They play a role in optimizing exhaust flow and can help reduce drone at certain RPMs.
• Hangars and Clamps: These are essential for mounting the exhaust system securely to the vehicle frame. High-quality hangars and clamps ensure that the exhaust maintains its position, minimizing vibrations and potential damage during operation.

How Does a Cat Back Exhaust System Improve Engine Performance?

A cat back exhaust system enhances engine performance by improving exhaust flow and reducing backpressure.

• Increased Exhaust Flow: A cat back exhaust system replaces the stock exhaust components from the catalytic converter to the rear of the vehicle, allowing for a more efficient exit of exhaust gases. This increased flow reduces restrictions, enabling the engine to expel spent gases more effectively, which can lead to improved horsepower and torque.
• Reduced Backpressure: By optimizing the path and diameter of the exhaust pipes, a cat back system minimizes the backpressure that can hinder engine performance. Lower backpressure allows the engine to breathe more freely, resulting in better throttle response and overall engine efficiency.
• Weight Reduction: Many aftermarket cat back exhaust systems are constructed from lighter materials, such as stainless steel or aluminum, compared to the stock exhaust. This reduction in weight can enhance the vehicle’s power-to-weight ratio, contributing to improved acceleration and handling.
• Improved Sound: Cat back systems often provide a deeper, more aggressive sound compared to factory exhausts. This enhanced auditory experience not only adds to the driving enjoyment but can also indicate that the engine is operating more efficiently, contributing to a sportier driving experience.
• Enhanced Aesthetics: Aftermarket cat back exhaust systems often come with polished tips and unique designs that can improve the visual appeal of the vehicle. This aesthetic upgrade can enhance the overall look of a Subaru, making it stand out while also potentially increasing its resale value.

What Are the Key Benefits of Upgrading to a Cat Back Exhaust for a Subaru?

Upgrading to a cat back exhaust for a Subaru offers several key benefits that enhance performance and driving experience.

• Improved Performance: A cat back exhaust system allows for better exhaust flow, which can lead to increased horsepower and torque. This is achieved by reducing back pressure and allowing the engine to breathe more freely during acceleration.
• Enhanced Sound: One of the most noticeable benefits is the deep, aggressive sound that a cat back exhaust provides. This can significantly amplify the sporty character of your Subaru, giving it a more exhilarating auditory experience.
• Weight Reduction: Many aftermarket cat back exhausts are made from lighter materials such as stainless steel or aluminum, which can reduce the overall weight of the vehicle. This weight reduction can improve handling and performance, especially in performance-oriented driving scenarios.
• Improved Fuel Efficiency: By optimizing exhaust flow, a cat back exhaust can lead to better fuel efficiency under certain driving conditions. When the engine operates more efficiently due to reduced restrictions, it can potentially result in better miles per gallon.
• Aesthetic Appeal: A cat back exhaust often features a more stylish design compared to the factory system, enhancing the visual appeal of your Subaru. Many options come with polished tips or unique shapes that can complement the vehicle’s overall look.
• Customizability: There is a wide range of options available for cat back exhaust systems, allowing owners to choose setups that best fit their performance goals and sound preferences. From resonators to muffler types, this flexibility makes it easier to tailor the exhaust system to personal tastes.

How Does a Cat Back Exhaust Affect Sound Quality?

• Sound Enhancement: A cat back exhaust system alters the exhaust flow dynamics, leading to a more aggressive and throaty sound.
• Material Quality: The materials used in cat back systems, such as stainless steel or aluminized steel, can influence the tone and durability of the exhaust note.
• Pipe Diameter: The diameter of the exhaust pipes affects the sound; wider pipes typically produce a deeper and more resonant sound, while narrower pipes may result in a higher pitch.
• Muffler Design: The type and design of the muffler can significantly change the exhaust sound, with options ranging from straight-through to chambered styles that offer distinct tonal qualities.
• Resonator Presence: The inclusion or absence of a resonator in the system can modify the sound, with resonators often softening certain frequencies for a smoother sound profile.

Sound Enhancement: A cat back exhaust system alters the exhaust flow dynamics, leading to a more aggressive and throaty sound. This change is due to the reduction of back pressure, allowing the engine to expel exhaust gases more efficiently, which results in a more pronounced engine note that many enthusiasts desire.

Material Quality: The materials used in cat back systems, such as stainless steel or aluminized steel, can influence the tone and durability of the exhaust note. Stainless steel is generally preferred for its resistance to rust and corrosion, which helps maintain the sound quality over time, while aluminized steel may provide a different tonal character but can deteriorate more quickly.

Pipe Diameter: The diameter of the exhaust pipes affects the sound; wider pipes typically produce a deeper and more resonant sound, while narrower pipes may result in a higher pitch. Choosing the right diameter is crucial, as it should balance sound quality with performance gains to avoid unwanted drone at cruising speeds.

Muffler Design: The type and design of the muffler can significantly change the exhaust sound, with options ranging from straight-through to chambered styles that offer distinct tonal qualities. Straight-through mufflers tend to produce a louder and more aggressive sound, while chambered mufflers can provide a balance between volume and a refined tone.

Resonator Presence: The inclusion or absence of a resonator in the system can modify the sound, with resonators often softening certain frequencies for a smoother sound profile. This is particularly important for reducing harshness and drone, making the driving experience more enjoyable, especially during long trips.

What Performance Gains Can You Expect from an Upgraded Exhaust?

Upgrading to the best Subaru cat back exhaust can yield significant performance gains in several areas:

• Increased Horsepower: An upgraded exhaust system typically allows for better airflow, which can lead to noticeable increases in horsepower. Improved exhaust flow reduces back pressure, enabling the engine to expel exhaust gases more efficiently and draw in more air for combustion.
• Enhanced Torque: Alongside horsepower, torque can also benefit from an upgraded exhaust. By optimizing exhaust flow, the engine can operate more effectively at various RPM levels, often resulting in improved low-end and mid-range torque, which enhances acceleration and drivability.
• Weight Reduction: Many aftermarket exhaust systems are constructed from lighter materials, such as stainless steel or titanium, leading to a reduction in overall vehicle weight. This weight savings contributes to improved handling and performance, as less weight can enhance both acceleration and braking.
• Improved Sound: Upgrading your cat back exhaust often results in a more aggressive and sporty sound profile. This auditory enhancement not only provides a more exhilarating driving experience but can also signify the increased performance capabilities of your vehicle.
• Better Fuel Efficiency: With improved exhaust flow and reduced back pressure, an upgraded exhaust system can potentially improve fuel efficiency. By optimizing engine performance, drivers may find they achieve better miles per gallon under certain driving conditions.

What Should You Consider When Choosing the Best Cat Back Exhaust for Your Subaru?

When choosing the best cat back exhaust for your Subaru, there are several important factors to consider:

• Material: The material of the exhaust system greatly affects its durability and performance. Stainless steel is often preferred due to its resistance to rust and corrosion, while aluminized steel is a more economical choice but may not last as long.
• Sound Level: The sound produced by the exhaust can significantly impact your driving experience. Some exhausts offer a deep, aggressive tone that enhances the sporty feel of your Subaru, while others are designed to maintain a quieter operation for a more subtle effect.
• Performance Gains: Different cat back exhaust systems can provide varying levels of performance improvements. Look for systems that are engineered to increase horsepower and torque, which can enhance your vehicle’s acceleration and overall driving dynamics.
• Fitment and Installation: Ensuring that the exhaust system fits your specific Subaru model is crucial for optimal performance. Some systems may require additional modifications for installation, so it’s important to consider whether you prefer a straightforward bolt-on installation or are willing to undertake more complex modifications.
• Design and Aesthetics: The visual appeal of the exhaust can be a significant factor for many enthusiasts. Consider the design of the exhaust tips and overall look of the system, as it should complement the style of your Subaru.
• Brand Reputation: The reputation of the manufacturer can often be an indicator of the quality and reliability of the exhaust system. Researching customer reviews and seeking recommendations from fellow Subaru owners can help in identifying reputable brands known for producing high-quality cat back exhausts.
• Price: Budget is often a deciding factor when choosing an exhaust system. It’s important to balance cost with quality and performance, as cheaper options may not provide the same benefits or longevity as higher-priced systems.

What Material Options Are Available and Which Is Best for Durability?

When selecting the best Subaru cat back exhaust, various material options are available, each with distinct characteristics affecting durability, performance, and sound.

• Stainless Steel: Stainless steel is the most popular choice for cat back exhaust systems due to its excellent resistance to rust and corrosion. It is durable and can withstand high temperatures, making it ideal for performance applications and ensuring a long lifespan.
• Aluminized Steel: Aluminized steel is a more affordable option that features a protective coating to resist corrosion. While it offers a decent level of durability, it may not last as long as stainless steel, particularly in harsh climates or under extreme driving conditions.
• Titanium: Titanium is a premium material known for its lightweight properties and exceptional strength. While it is the most expensive option, it provides superior resistance to corrosion and can significantly reduce the overall weight of the exhaust system, enhancing performance.
• Carbon Fiber: Carbon fiber is a high-tech material that is lightweight and offers a unique aesthetic appeal. Although it is not as common for cat back exhaust systems, it can provide a stylish look while still maintaining durability, though it may not be as robust as stainless steel or titanium.

How Important Is Fitment and Installation Ease When Selecting an Exhaust?

Fitment and installation ease are crucial factors when selecting the best Subaru cat back exhaust, as they can significantly impact performance and user experience.

• Compatibility: Ensuring the exhaust is specifically designed for your Subaru model is essential for optimal performance. A compatible exhaust will align perfectly with the mounting points and exhaust hangers, preventing any unnecessary vibrations or leaks.
• Installation Process: Many aftermarket exhausts come with detailed installation guides or are designed for a straightforward bolt-on process. An easy installation can save you time, reduce labor costs, and minimize the need for professional help, making it accessible for DIY enthusiasts.
• Material Quality: The material used in the exhaust affects both fitment and installation ease. For example, stainless steel systems tend to be more durable and resist corrosion, which can lead to a smoother fit and longer-lasting performance compared to cheaper materials that may warp over time.
• Weight Considerations: A lighter exhaust can improve overall vehicle performance, but it’s important to ensure that the reduced weight does not compromise structural integrity or fitment. Properly designed lightweight exhaust systems can enhance performance without sacrificing ease of installation.
• Sound Characteristics: The fitment of the exhaust also influences the sound produced by the vehicle. An exhaust that fits well will maintain the desired sound profile without unwanted droning or harshness, enhancing the driving experience while fitting seamlessly with the vehicle’s design.

What Are the Top Cat Back Exhaust Systems Recommended for Subaru?

The best cat back exhaust systems for Subaru enhance performance, sound, and aesthetics.

• Invidia Q300: The Invidia Q300 is known for its aggressive yet refined sound, making it a popular choice among Subaru enthusiasts. This exhaust system features 70mm piping for improved airflow and is constructed from high-quality stainless steel, ensuring durability and resistance to corrosion.
• Borla S-Type: The Borla S-Type exhaust system is designed to deliver a deep, throaty sound while also providing a significant performance boost. Its straight-through design enhances exhaust flow, which contributes to increased horsepower and torque, while the T-304 stainless steel construction guarantees long-lasting performance.
• GReddy Revolution RS: The GReddy Revolution RS exhaust system is engineered for maximum performance, featuring a lightweight design and a distinctive sound profile. It utilizes a unique muffler design to reduce back pressure, improving overall efficiency, and is made from high-grade stainless steel for resilience against the elements.
• HKS Hi-Power: The HKS Hi-Power exhaust system is renowned for its sporty sound and sleek design, tailored specifically for Subaru models. It incorporates a smooth, mandrel-bent piping layout to promote optimal exhaust flow, helping to achieve better throttle response and performance without excessive noise.
• MagnaFlow Cat-Back Exhaust: The MagnaFlow Cat-Back Exhaust system stands out for its deep, aggressive tone and effective performance gains. Its mandrel-bent tubing and high-quality stainless steel construction ensure a smooth flow of exhaust gases, while the straight-through muffler design reduces back pressure and enhances engine efficiency.

What Do Enthusiasts and Users Say About Popular Cat Back Exhaust Brands?

Enthusiasts and users often review popular cat back exhaust brands based on performance, sound quality, and ease of installation.

• MagnaFlow: Known for its deep, aggressive sound, MagnaFlow exhaust systems are highly praised for their stainless steel construction and durability. Users report noticeable performance improvements and enhanced throttle response, making it a favorite among Subaru owners looking for both sound and functionality.
• Borla: Borla exhausts are celebrated for their unique sound and high-quality materials, often providing a more refined tone compared to other brands. Many users appreciate the emphasis on performance, claiming better horsepower and torque while maintaining a lightweight design that doesn’t compromise on aesthetics.
• Invidia: Invidia is well-regarded for its aggressive sound profile and high-flow design, which enhances exhaust flow and overall vehicle performance. Enthusiasts frequently mention the excellent fitment and ease of installation, along with a distinctive look that complements the sporty design of their Subarus.
• HKS: HKS exhaust systems are favored for their engineering precision and performance tuning capabilities. Users often highlight the balance between sound and performance, with many stating that HKS systems provide a perfect blend of aggressive noise and effective exhaust flow without being overly loud.
• Greddy: Greddy is recognized for its innovative design and superior build quality, often offering systems that are both visually appealing and functional. Users report a smooth, throaty sound that enhances the driving experience while also improving the overall power delivery of their Subaru engines.
• Remus: Remus exhausts are known for their stylish design and refined sound, appealing to those who prefer a more subtle yet sporty note. Users appreciate the craftsmanship that goes into each system, often noting the increase in performance without overwhelming noise levels, making it a great choice for daily drivers.

How Much Should You Expect to Pay for a Subaru Cat Back Exhaust?

• Budget Options: Typically priced between $300 to $500, these exhaust systems are often made from less expensive materials like aluminized steel.
• Mid-Range Options: Ranging from $500 to $800, these exhausts usually feature better build quality, often using stainless steel, and provide a balanced performance and sound upgrade.
• High-End Options: Priced from $800 to $1,500 or more, these premium exhaust systems offer superior materials, advanced engineering, and significant performance enhancements.
• Custom Exhaust Systems: Custom setups can vary widely in price, generally starting around $1,000 and going up depending on the complexity and materials chosen.

Budget Options: These exhaust systems are a great entry point for Subaru owners looking to enhance their vehicle’s sound without breaking the bank. Typically made from aluminized steel, they offer decent durability but may not last as long as their more expensive counterparts, especially in harsh weather conditions.

Mid-Range Options: Mid-range cat back exhausts provide a significant improvement in both sound and performance, using higher-quality stainless steel that resists corrosion better than budget options. They often feature mandrel bends for smoother exhaust flow, which can lead to a slight increase in horsepower and torque.

High-End Options: High-end cat back exhaust systems are designed for enthusiasts who seek the best performance and sound. Made from premium materials like T304 stainless steel, they often come with features such as adjustable tips and polished finishes, ensuring longevity and aesthetic appeal along with enhanced engine performance.

Custom Exhaust Systems: For those looking for a unique setup tailored to their specific preferences, custom exhaust systems offer the ultimate flexibility. The price can vary greatly based on the materials used, the complexity of the design, and the labor involved, but they can result in a one-of-a-kind exhaust note and performance tailored to the driver’s needs.

What Maintenance Tips Will Help Your Cat Back Exhaust Last Longer?

To ensure your Subaru’s cat back exhaust system lasts longer, consider the following maintenance tips:

• Regular Inspections: Frequently check your cat back exhaust for any signs of rust, damage, or loose fittings.
• Clean the Exhaust System: Regularly clean the exhaust pipes to prevent soot buildup and corrosion.
• Check Mounting Hardware: Ensure that all mounting brackets and hangers are secure and free from wear to avoid misalignment.
• Monitor Exhaust Leaks: Listen for unusual sounds or inspect for leaks that could indicate damage or improper installation.
• Use Quality Fuel: Opt for high-quality fuel to minimize carbon buildup in your exhaust system.

Regular Inspections: Conducting regular inspections helps to identify early signs of wear and tear, such as rust or cracks, which can lead to larger issues if left unaddressed. This proactive approach allows for timely repairs that can extend the lifespan of your exhaust system.

Clean the Exhaust System: Cleaning the exhaust pipes is essential as soot and other debris can accumulate over time, leading to blockages and corrosion. A thorough cleaning can prevent these issues and maintain optimal performance.

Check Mounting Hardware: The mounting hardware plays a critical role in holding the exhaust system in place. Checking for secure fittings and replacing any worn-out parts can prevent misalignment, which could cause further damage or noise.

Monitor Exhaust Leaks: Listening for unusual sounds or checking for leaks can help identify problems early on. Exhaust leaks not only affect performance but can also lead to more severe damage to the exhaust system if not resolved quickly.

Use Quality Fuel: Using higher-quality fuel can significantly reduce carbon buildup within the exhaust system, leading to better efficiency and longevity. This practice helps maintain a clean exhaust flow and reduces the risk of clogging.

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