BMW 135i Exhaust System Kits

Add power, sound and unique style to your BMW X5/X6 M with this cat-back system which produced gains of up to +20 horsepower and +33 lbs. x ft. torque as measured on our in-house dyno. Dual 3″ to 2-1/2″ mandrel-bent, brush finished 304 stainless steel tubing keeps exhaust flowing smoothly for power gains you can feel. Designed with a transverse, high flow muffler finished in high temp powder coating for long lasting good looks and unique sound. The factory exhaust valve motor is used to regulate the exhaust flow from a closed-valve, sporty tone to wide-open, aggressive, performance sound.

Product Features:

• 100 Percent CAD Designed Custom Factory Fitment
• Evenly Distributes Exhaust Pulses
• TIG Welded For Strength
• Corrosion Resistance/Durability

The MagnaFlow Sport Series Cat-Back Performance Exhaust System 19187 enhances your 3.0L 2015-2020 BMW with an aggressive character that is sure to help you stand out from the other BMW you encounter on the street. With its 2.5in. diameter fast-flowing mandrel bent main piping that passes through 1 Straight-Through mufflers before ending in a Quad Split Rear exit with 3.5in. Black Coated Welded-On Double Wall Angle Cut Folded Edge tips, this dyno-proven BMW exhaust system refuses to be ignored. As such, 19187 is tuned to produce our powerful, resonant signature exhaust note at Aggressive exterior and Moderate interior sound levels, so please check to ensure compliance with local noise regulations. The system’s cat-back design replaces all your import’s stock exhaust components from the catalytic converter on back. Extensive 3D scanning and CNC precision robotic manufacturing techniques are used to ensure that your exhaust system fits perfectly with just a simple do-it-yourself installation process. The durable, corrosion resistant stainless steel construction of 19187 is backed by MagnaFlow’s finish warranty and limited construction warranty.

Product Features:

• High-performance lightweight design
• Dyno-proven performance
• Racing inspired sound

Aggressive Sound: A free-flowing, transverse muffler is used to absorb high pitch tones producing a powerful sound and unleashing all available horsepower and torque. The muffler is finished with a high-temp powder-coated black finish and a stamped aFe power logo. Exhaust Valve: This -cat-back exhaust system incorporates a factory style exhaust valve which uses the factory exhaust valve motor (not included). The valve helps regulate, direct and control the flow of exhaust gases by opening, closing, or partially obstructing passageways depending on throttle position for maximum performance. Simple Installation: This MACH Force-Xp cat-back exhaust system uses factory mounting locations providing stability and a hassle-free installation. Dual 4″ Gloss Black Tips: Finishing off this system are dual 4″ diameter, gloss black, 304 stainless steel tips. The tips come with a laser-etched aFe power logo for an aggressive style. Leak-Free Seal: High quality band clamps are used for a complete 360 degree sealing surface. Brushed 304 SS Construction: The performance cat-back exhaust system is constructed of 3″ to 2-1/2″ mandrel-bent, brushed 304 stainless steel tubing for maximum performance, corrosion resistance and strength eliminating cracking.

Product Features:

• 100% Hand TIG-Welded 304 Stainless Steel Tubing
• Factory Style Exhaust Valve
• High Flow Transverse Muffler
• Dual Gloss Black 304 Stainless Steel Tips

Aggressive Sound: A free-flowing, transverse muffler is used to absorb high pitch tones producing a powerful sound and unleashing all available horsepower and torque. The muffler is finished with a high-temp powder-coated metallic black finish and a stamped aFe power logo. Exhaust Valve: This axle-back exhaust system incorporates a factory style exhaust valve which uses the factory exhaust valve motor (not included). The valve helps regulate, direct and control the flow of exhaust gases by opening, closing, or partially obstructing passageways depending on throttle position for maximum performance. Simple Installation: This MACH Force-Xp axle-back exhaust system uses factory mounting locations providing stability and a hassle-free installation. Quad 3-1/2″ Stainless Steel Tips: Finishing off this system are Quad 3-1/2″ diameter, 304 stainless steel tips with laser-etched aFe POWER logos. Brushed 304 SS Construction: The performance axle-back exhaust system is constructed of 2-1/2″ to 3″ mandrel-bent, brushed 304 stainless steel tubing for maximum performance, corrosion resistance and strength eliminating cracking.

Product Features:

• 100% Hand TIG-Welded 304 Stainless Steel Tubing
• Factory Style Exhaust Valve
• Utilizes High Flow Transverse Muffler
• Quad Gloss Black 304 Stainless Steel Tips

The Mach Force XP cat-back exhaust system produces 11 hp and 10 lbs./ft. of torque. constructed from 2.75 in. mandrel bent 304 hand brushed stainless steel and utilizes a unique crossover pipe that helps to equalize exhaust pressure and tunes the exhaust pulse. Comes with dual 3.5 in. polished 304 stainless steel tips and muffler to build a mellow yet powerful sound. Engineered and manufactured in our Corona Ca manufacturing facility. All systems use factory mounting locations providing stability and hassle-free installation. High quality band clamps are used for a complete 360 deg. sealing surface. A free flowing muffler is used to absorb high pitch tones producing a powerful sound and unleashing all available horsepower and torque. The crossover balance tube equalizes and evenly distributes exhaust pulses traveling through the exhaust system. This not only creates more efficient flow and better performance it also reduces sound decibels ultimately minimizing exhaust drone.

Product Features:

• 100% TIG-Welded
• Dual High Flow Mufflers
• Uses Factory Mounting Locations
• Street Legal

Aggressive Sound: A free-flowing, transverse muffler is used to absorb high pitch tones producing a powerful sound and unleashing all available horsepower and torque. The muffler is finished with a high-temp powder-coated metallic black finish and a stamped aFe power logo. Exhaust Valve: This axle-back exhaust system incorporates a factory style exhaust valve which uses the factory exhaust valve motor (not included). The valve helps regulate, direct and control the flow of exhaust gases by opening, closing, or partially obstructing passageways depending on throttle position for maximum performance. Simple Installation: This MACH Force-Xp axle-back exhaust system uses factory mounting locations providing stability and a hassle-free installation. Quad 3-1/2″ Stainless Steel Tips: Finishing off this system are Quad 3-1/2″ diameter, 304 stainless steel tips with laser-etched aFe POWER logos. Brushed 304 SS Construction: The performance axle-back exhaust system is constructed of 2-1/2″ to 3″ mandrel-bent, brushed 304 stainless steel tubing for maximum performance, corrosion resistance and strength eliminating cracking.

Product Features:

• 100% Hand TIG-Welded 304 Stainless Steel Tubing
• Factory Style Exhaust Valve
• Utilizes High Flow Transverse Muffler
• Quad Polished 304 Stainless Steel Tips

Exhaust Valve: This axle-back exhaust system incorporates a factory style exhaust valve which uses the factory exhaust valve motor (not included). The valve helps regulate, direct and control the flow of exhaust gases by opening, closing, or partially obstructing passageways depending on throttle position for maximum performance. Simple Installation; This MACH Force-Xp axle-back exhaust system uses factory mounting locations providing stability and a hassle-free installation. Dual 4″ Gloss Black Tips; Finishing off this system are dual 4″ diameter, gloss black, 304 stainless steel tips. The tips come with a laser-etched aFe power logo for an aggressive style. Leak-Free Seal: High quality band clamps are used for a complete 360 degree sealing surface. Brushed 304 SS Construction: The performance axle-back exhaust system is constructed of 3″ to 2-1/2″ mandrel-bent, brushed 304 stainless steel tubing for maximum performance, corrosion resistance and strength eliminating cracking.

Product Features:

• 100% Hand TIG-Welded 304 Stainless Steel Tubing
• Factory Style Exhaust Valve
• Utilizes High Flow Transverse Muffler
• Dual Gloss Black 304 Stainless Steel Tips

The MagnaFlow 2006-2010 BMW M5 Touring Series Cat-Back Performance Exhaust System is the perfect partner for your 5.0L 2006-2010 BMW M5 to take on a grand tour or a weekend cruise thanks to the powerful, resonant exhaust note and dyno-proven performance it brings to the table. This durable, corrosion resistant stainless steel exhaust kit is engineered to conquer the miles with ease while enhancing your driving experience with Moderate exterior and Mild interior sound levels generated through its fast-flowing, mandrel bent 2.5in. main piping and 3 Straight-Through muffler that terminate in a Quad Split Rear exit with 4in. Polished Welded-On Double Wall Angle Cut Rolled Edge tips. 16859 features a cat-back layout design to replace your import’s stock exhaust components from the catalytic converter on back. This BMW M5 exhaust system is compatible with 2006-2010 engines. The use of extensive 3D scans made during the development process has resulted in an easy-to-install, direct-fit design that fits your BMW M5 like a glove. 16859 is produced using CNC precision robotic manufacturing techniques and is backed by MagnaFlow’s limited construction warranty.

Product Features:

• 409 Stainless Steel Construction
• Increased Horsepower and Torque
• Mandrel bent tubing

This system is constructed of 2.5 in. diameter, mandrel bent, TIG-welded, 304 stainless steel, brushed finish tubing and uses all factory mounting locations for an approximate 1 hour install time. In recent testing, this exhaust system produced 12 horsepower and 11 lbs. x ft. of torque. This unique system utilizes 3.5 in. diameter 304 polished laser etched quad tips that fit perfectly in your stock bumper cutouts. All aFe systems are engineered and manufactured in our Corona, California manufacturing facility.

Product Features:

• 2.5 in. Dia. 304 Stainless Steel
• 100% Hand TIG Welded
• Hand Brushed Finish
• Polished Quad Tips

Exhaust Valve: This axle-back exhaust system incorporates a factory style exhaust valve which uses the factory exhaust valve motor (not included). The valve helps regulate, direct and control the flow of exhaust gases by opening, closing, or partially obstructing passageways depending on throttle position for maximum performance. Simple Installation; This MACH Force-Xp axle-back exhaust system uses factory mounting locations providing stability and a hassle-free installation. Dual 4″ Gloss Black Tips; Finishing off this system are dual 4″ diameter, gloss black, 304 stainless steel tips. The tips come with a laser-etched aFe power logo for an aggressive style. Leak-Free Seal: High quality band clamps are used for a complete 360 degree sealing surface. Brushed 304 SS Construction: The performance axle-back exhaust system is constructed of 3″ to 2-1/2″ mandrel-bent, brushed 304 stainless steel tubing for maximum performance, corrosion resistance and strength eliminating cracking.

Product Features:

• 100% Hand TIG-Welded 304 Stainless Steel Tubing
• Factory Style Exhaust Valve
• Utilities High Flow Traverse Muffler w/High Temp Black Finish
• Uses Factory Hanger Locations For Hassle Free Installation

Exhaust Valve: This axle-back exhaust system incorporates a factory style exhaust valve which uses the factory exhaust valve motor (not included). The valve helps regulate, direct and control the flow of exhaust gases by opening, closing, or partially obstructing passageways depending on throttle position for maximum performance. Simple Installation; This MACH Force-Xp axle-back exhaust system uses factory mounting locations providing stability and a hassle-free installation. Dual 4″ Polished Tips; Finishing off this system are dual 4″ diameter, polished, 304 stainless steel tips. The tips come with a laser-etched aFe power logo for an aggressive style. Leak-Free Seal: High quality band clamps are used for a complete 360 degree sealing surface. Brushed 304 SS Construction: The performance axle-back exhaust system is constructed of 3″ to 2-1/2″ mandrel-bent, brushed 304 stainless steel tubing for maximum performance, corrosion resistance and strength eliminating cracking.

Product Features:

• 100% Hand TIG-Welded 304 Stainless Steel Tubing
• Factory Style Exhaust Valve
• Utilizes High Flow Transverse Muffler
• Dual Polished 304 Stainless Steel Tips

Borla Performance Industries is the pioneer and leader in the design and manufacture of stainless steel performance exhaust. We began two decades ago as a manufacturer of exhaust systems for such “concours classics” as Rolls-Royce and Ferrari cars and have evolved into the premier manufacturer of today’s performance vehicles for the street, off-road, and racing.Borla is proud to offer a true “Made in the USA” product sold around the world. We are a company of motorheads, and it shows in our products, customer service, and culture. On weekends, the same Borla employees who built your exhaust or helped you with technical support can be found competing at tracks, drag strips, off-road events and car shows. Constructed using T-304 stainless steel for long life and sharp appearance, and features all welded construction for maximum durability. Unlike any other exhaust brand, Borla’systems are designed from scratch on a vehicle-by-vehicle basis. Every car or truck has unique mechanical and acoustical properties, all taken into account as we spend countless hours optimizing muffler body shapes, internal core configurations, flow dynamics,soundand more.

Product Features:

• Increased exhaust velocity adds power, driving excitement, fuel economy, and the distinctive powerful sound
• Each system is built from premium, high-quality austenitic T-304 stainless steel
• Ultra-smooth mandrel bends ensure maximum flow & power, and precision computer-controlled CNC manufacturing ensures an accurate fit

The MagnaFlow Touring Series Cat-Back Performance Exhaust System 16560 is the perfect partner for your 4.4L, 4.8L 2004-2010 BMW to take on a grand tour or a weekend cruise thanks to the powerful, resonant exhaust note and dyno-proven performance it brings to the table. This durable, corrosion resistant stainless steel exhaust kit is engineered to conquer the miles with ease while enhancing your driving experience with Moderate exterior and Mild interior sound levels generated through its fast-flowing, mandrel bent 2.5in. main piping and 3 Straight-Through muffler that terminate in a Dual Split Rear exit with 3.25 x 4.75in. Polished Welded-On Double Wall Straight Cut Rolled Edge tips. 16560 features a cat-back layout design to replace your import’s stock exhaust components from the catalytic converter on back. This BMW exhaust system is compatible with 2004-2010 engines. The use of extensive 3D scans made during the development process has resulted in an easy-to-install, direct-fit design that fits your BMW like a glove. 16560 is produced using CNC precision robotic manufacturing techniques and is backed by MagnaFlow’s limited construction warranty.

Product Features:

• 409 Stainless Steel Construction
• Increased Horsepower and Torque
• Mandrel bent tubing

The MagnaFlow 2008-2013 BMW M3 Touring Series Cat-Back Performance Exhaust System is the perfect partner for your 4.0L 2008-2013 BMW M3 to take on a grand tour or a weekend cruise thanks to the powerful, resonant exhaust note and dyno-proven performance it brings to the table. This durable, corrosion resistant stainless steel exhaust kit is engineered to conquer the miles with ease while enhancing your driving experience with Moderate exterior and Mild interior sound levels generated through its fast-flowing, mandrel bent 2.5in. main piping and 2 Straight-Through muffler that terminate in a Quad Split Rear exit with 3.5in. Polished Welded-On Double Wall Angle Cut Folded Edge tips. 15544 features a cat-back layout design to replace your import’s stock exhaust components from the catalytic converter on back. This BMW M3 exhaust system is compatible with 2008-2013 engines. The use of extensive 3D scans made during the development process has resulted in an easy-to-install, direct-fit design that fits your BMW M3 like a glove. 15544 is produced using CNC precision robotic manufacturing techniques and is backed by MagnaFlow’s limited construction warranty.

Product Features:

• 409 Stainless Steel Construction
• Increased Horsepower and Torque
• Mandrel bent tubing

Unleash power and sound while improving the looks on your Z4 M Coupe with this MACH Force-Xp 2-1/2″ 304 stainless steel cat back system. The larger diameter, mandrel bent tubing along with high-flow, stainless steel mufflers are less restricting for maximum flow, optimum sound and long lasting good looks. 100% hand TIG-welded for proven quality and durability, this MACH Force-Xp system is finished off with quad 3″ polished, stainless steel exhaust tips with laser-etched aFe POWER logos to give your E86 a track-prepped, custom look. Performance Gains: In testing, the cat-back exhaust system resulted in gains up to +7 horsepower and +15 lbs. x ft. of torque, as measured on our in-house dyno. Quad 3″ Diameter Stainless Steel Tips: Quad, rear exit, 3″ diameter, angle cut stainless steel exhaust tips with an aFe POWER logo laser-etched on the top for a custom look. High-Flow Performance Muffler: Incorporating less-restricting dual, high-flow, 304 stainless steel mufflers into the exhaust system to eliminate exhaust drone, maintaining a smooth, unique sound. 2-1/2″ 304 Stainless Steel Tubing: Less restrictive than stock exhaust allows maximum flow and low turbulence; increasing torque, horsepower and improved throttle response. Perfect Fit: OE-style bayonet hangers are used to maintain a stable pipe location during high vibration and high heat conditions. The Bayonet tip holds the hanger bushing in place for an OE style fit that does not change with time. Hassle-Free Installation: This exhaust system is designed to be a true bolt on system with no cutting or modifications required. Quality hardware and clamps are included for a hassle-free installation.

Product Features:

• +15 ft. x lbs. TQ & +15 HP
• Mandrel Bent 304 Stainless Steel Tubing
• Improved Performance and Rust Resistant Finish
• 100 Percent Hand TIG-Welded For Race Proven Strength

The MagnaFlow Sport Series Cat-Back Performance Exhaust System 16542 enhances your 3.0L 2007-2010 BMW with an aggressive character that is sure to help you stand out from the other BMW you encounter on the street. With its 2.5in. diameter fast-flowing mandrel bent main piping that passes through 2 Straight-Through mufflers before ending in a Dual Split Rear exit with 4in. Polished Welded-On Double Wall Angle Cut Rolled Edge tips, this dyno-proven BMW exhaust system refuses to be ignored. As such, 16542 is tuned to produce our powerful, resonant signature exhaust note at Aggressive exterior and Moderate interior sound levels, so please check to ensure compliance with local noise regulations. The system’s cat-back design replaces all your import’s stock exhaust components from the catalytic converter on back. Extensive 3D scanning and CNC precision robotic manufacturing techniques are used to ensure that your exhaust system fits perfectly with just a simple do-it-yourself installation process. The durable, corrosion resistant stainless steel construction of 16542 is backed by MagnaFlow’s limited lifetime warranty.

Product Features:

• High-performance lightweight design
• Dyno-proven performance
• Racing inspired sound

The MagnaFlow Touring Series Cat-Back Performance Exhaust System 16537 is the perfect partner for your 3.0L 2006-2011 BMW to take on a grand tour or a weekend cruise thanks to the powerful, resonant exhaust note and dyno-proven performance it brings to the table. This durable, corrosion resistant stainless steel exhaust kit is engineered to conquer the miles with ease while enhancing your driving experience with Moderate exterior and Mild interior sound levels generated through its fast-flowing, mandrel bent 2.5in. main piping and 2 Straight-Through muffler that terminate in a Dual Straight Driver Side Rear exit with 3.5in. Polished Welded-On Double Wall Angle Cut Folded Edge tips. 16537 features a cat-back layout design to replace your import’s stock exhaust components from the catalytic converter on back. This BMW exhaust system is compatible with 2006-2011 engines. The use of extensive 3D scans made during the development process has resulted in an easy-to-install, direct-fit design that fits your BMW like a glove. 16537 is produced using CNC precision robotic manufacturing techniques and is backed by MagnaFlow’s limited construction warranty.

Product Features:

• 409 Stainless Steel Construction
• Increased Horsepower and Torque
• Mandrel bent tubing

The MagnaFlow Touring Series Cat-Back Performance Exhaust System 16532 is the perfect partner for your 2.5L, 2.8L 1998-2000 BMW to take on a grand tour or a weekend cruise thanks to the powerful, resonant exhaust note and dyno-proven performance it brings to the table. This durable, corrosion resistant stainless steel exhaust kit is engineered to conquer the miles with ease while enhancing your driving experience with Moderate exterior and Mild interior sound levels generated through its fast-flowing, mandrel bent 2.5in. main piping and 2 Straight-Through muffler that terminate in a Dual Straight Driver Side Rear exit with 3in. Polished Welded-On Double Wall Angle Cut Rolled Edge tips. 16532 features a cat-back layout design to replace your import’s stock exhaust components from the catalytic converter on back. This BMW exhaust system is compatible with 1998-2000 engines. The use of extensive 3D scans made during the development process has resulted in an easy-to-install, direct-fit design that fits your BMW like a glove. 16532 is produced using CNC precision robotic manufacturing techniques and is backed by MagnaFlow’s limited construction warranty.

Product Features:

• 409 Stainless Steel Construction
• Increased Horsepower and Torque
• Mandrel bent tubing

The MagnaFlow 2013-2018 BMW 320i Touring Series Cat-Back Performance Exhaust System is the perfect partner for your 2.0L 2013-2018 BMW 320i to take on a grand tour or a weekend cruise thanks to the powerful, resonant exhaust note and dyno-proven performance it brings to the table. This durable, corrosion resistant stainless steel exhaust kit is engineered to conquer the miles with ease while enhancing your driving experience with Moderate exterior and Mild interior sound levels generated through its fast-flowing, mandrel bent 2.5in. main piping and 2 Straight-Through muffler that terminate in a Single Straight Driver Side Rear exit with 3.5in. Polished Welded-On Double Wall Angle Cut Folded Edge tips. 15235 features a cat-back layout design to replace your import’s stock exhaust components from the catalytic converter on back. This BMW 320i exhaust system is compatible with 2013-2018 engines. The use of extensive 3D scans made during the development process has resulted in an easy-to-install, direct-fit design that fits your BMW 320i like a glove. 15235 is produced using CNC precision robotic manufacturing techniques and is backed by MagnaFlow’s limited construction warranty.

Product Features:

• 409 Stainless Steel Construction
• Increased Horsepower and Torque
• Mandrel bent tubing

BRExhaust Direct-Fit Replacement Exhaust Kit 106-0832 takes the guesswork out of replacing your exhaust system while providing a reliable and high-quality alternative to the OEM exhaust. You will find all of the gaskets and clamps needed to get the job done in the carefully packaged box. 106-0832’s precision mandrel bent pipes facilitate superior exhaust flow compared to the crush-bent pipes commonly used in competing aftermarket replacement exhaust systems. The multi-piece, bolt-on design ensures the exhaust system is easy to install yourself and fits perfectly to help get you back on the road in no time. No bending or welding is required for installation. BRExhaust Direct-Fit Replacement Exhaust Kit 106-0832 features durable aluminized steel construction and is covered by a limited warranty. BRExhaust 106-0832 is engineered for OEM 18111723678 exhaust replacement.

Product Features:

• Complete mandrel-bent replacement of all parts from behind or near the last catalytic converter, offering long-lasting, high corrosion resistance and durability
• Bolt-on, multi-piece design for smooth and easy DIY installation around obstructions, ensuring quality fitment and function without requiring fabrication
• All components, gaskets, clamps, and hardware required, along with installation instructions, are packaged together in a single protective box
• Leaves all emissions equipment intact, maintaining emissions compliance

The Mach Force XP cat-back exhaust system produces 11 hp and 10 lbs./ft. of torque. constructed from 2.75 in. mandrel bent 304 hand brushed stainless steel and utilizes a unique crossover pipe that helps to equalize exhaust pressure and tunes the exhaust pulse. Comes with dual 3.5 in. polished 304 stainless steel tips and muffler to build a mellow yet powerful sound. Engineered and manufactured in our Corona Ca manufacturing facility. All systems use factory mounting locations providing stability and hassle-free installation. High quality band clamps are used for a complete 360 deg. sealing surface. A free flowing muffler is used to absorb high pitch tones producing a powerful sound and unleashing all available horsepower and torque. The crossover balance tube equalizes and evenly distributes exhaust pulses traveling through the exhaust system. This not only creates more efficient flow and better performance it also reduces sound decibels ultimately minimizing exhaust drone.

Product Features:

• 3 in. Mandrel Bent 304 Stainless Steel Tubing
• Mirror Polished Finish
• Maximum Flow
• 3 in. Resonator

BRExhaust Direct-Fit Replacement Exhaust Kit 106-0909 takes the guesswork out of replacing your exhaust system while providing a reliable and high-quality alternative to the OEM exhaust. You will find all of the gaskets and clamps needed to get the job done in the carefully packaged box. 106-0909’s precision mandrel bent pipes facilitate superior exhaust flow compared to the crush-bent pipes commonly used in competing aftermarket replacement exhaust systems. The multi-piece, bolt-on design ensures the exhaust system is easy to install yourself and fits perfectly to help get you back on the road in no time. No bending or welding is required for installation. BRExhaust Direct-Fit Replacement Exhaust Kit 106-0909 features durable aluminized steel construction. BRExhaust 106-0909 is engineered for OEM 18107500194 exhaust replacement.

Product Features:

• Complete mandrel-bent replacement of all parts from behind or near the last catalytic converter, offering long-lasting, high corrosion resistance and durability
• Bolt-on, multi-piece design for smooth and easy DIY installation around obstructions, ensuring quality fitment and function without requiring fabrication
• All components, gaskets, clamps, and hardware required, along with installation instructions, are packaged together in a single protective box
• Leaves all emissions equipment intact, maintaining emissions compliance

Direct-Fit Exhaust System Replacement Kit