Axleback exhaust systems generally include what's behind your rear axle. These are among the easiest of exhaust upgrades to install, and give you an instant upgrade in sound.
Active Autowerke’s G8X Valved Rear Exhaust section is the result of over 40 years of BMW-specific R&D. While the primary goal is a superior sound signature, the engineering team focused heavily on optimum exhaust flow and weight reduction. By replacing the dense factory muffler assembly with a streamlined stainless steel unit, this exhaust reduces weight hanging off the rear of the car while maximizing exhaust gas scavenging. The internal geometry is designed to provide a smooth transition of gases, which is critical for maintaining turbocharger efficiency on high-horsepower builds. Key Features: OEM+ Integration: Reuses the stock BMW valve actuators, meaning no extra wiring, controllers, or dash errors. Resonance Control: Internal muffler chambers are tuned to eliminate cabin drone while allowing the S58 character to shine under load. Industrial Durability: Full 304 Stainless Steel construction ensures maximum resistance to heat cycles and corrosion. Fitment Guaranteed: Every exhaust is test-fitted on an in-house G8X fixture as part of a rigorous quality control measure. Specifications & Tip Options: Configuration: Valved Axle-back (Connects to factory or aftermarket mid-pipes) Installation: Bolt-on design; includes all necessary heavy-duty clamps and hardware Available Tip Styles: Brushed Stainless Steel Matte Black Coated Genuine Carbon Fiber Vehicle Fitment: * 2021+ BMW M3 Sedan (G80) 2021+ BMW M4 Coupe (G82) 2021+ BMW M4 Convertible (G83)
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For the owner of the new G90 M5, the Active Autowerke Signature Catback System offers the perfect balance of luxury refinement and aggressive performance. Constructed entirely from corrosion-resistant T304 stainless steel, this system is built to withstand extreme thermal loads while maintaining a lifetime of consistent finish. The engineering team focused heavily on "Sound Engineering," ensuring that while the exhaust is louder and deeper than stock, it remains completely free of interior cabin drone—a critical requirement for the high-end M5 experience. With its direct-fit installation and a variety of 112mm quad tip finishes, this exhaust provides a surgical fit and a premium upgrade that complements the caliber of the world’s most powerful M-sedan. Key Features: USA Fabricated: Hand-made in Miami, FL, using precision TIG welding and master fixtures for a guaranteed fit. Daily Driveability: Tuned for a clean, sophisticated idle and low-drone cruising, ideal for long highway trips. Advanced Material Science: T304 Stainless construction offers superior heat resistance and long-term durability. Inclusive Hardware Kit: Includes all clamps, gaskets, and valve motor brackets required for a seamless install. Enhanced Visuals: Quad 112mm dual-wall tips are designed to resist heat discoloration and fill out the bumper cutouts. Specifications: System Type: Valved Full Catback Exhaust Tubing: Mandrel-bent for zero-turbulence exhaust gas flow Valve Operation: Independent remote-controlled electronic valves Performance Gain: +20–25 lb-ft torque (Estimated) Vehicle Fitment: 2025+ BMW M5 (G90 Sedan and G99 Touring) Tip Options: Brushed Stainless Matte Black Carbon Fiber
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For over 40 years, Active Autowerke has been at the forefront of BMW performance, and the G4X M240i axle-back exhaust represents the pinnacle of that development. This system is constructed entirely from TIG-welded 304 stainless steel, offering maximum resistance to corrosion and heat cycles. Unlike universal systems, this exhaust is engineered specifically for the G42 chassis, ensuring that every hanger and flange aligns perfectly. By retaining the factory valve control, this exhaust offers a "no-compromise" solution: it stays quiet and sophisticated when you need it, but opens up for maximum volume and performance when you want it. Each kit is a comprehensive package, providing all hardware required to transform your M240i’s rear section. Key Features: Surgical Precision: Every unit is test-fitted on a dedicated fixture to ensure zero-clearance issues with the chassis or diffuser. Premium Materials: Full 304 Stainless Steel construction ensures a lifetime of performance. OEM Integration: No need for extra wiring or controllers; works seamlessly with your car's computer. Aggressive Rear Stance: Fills the rear bumper cutouts more effectively than the stock rectangular tips. Performance Gains: Improved exhaust scavenging contributes to a more responsive B58 engine. Specifications: Type: Valved Rear Axle-back Exhaust Section SKU: 11-125 Finish: Brushed Stainless (Standard) Hardware: Includes all high-grade connecting hardware Vehicle Fitment: * 2022+ BMW M240i / M240i xDrive (G42 Chassis) Custom Options: Available in multiple tip finishes to match your specific trim package
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For the owner of the new G90 M5, the Active Autowerke Signature Catback System offers the perfect balance of luxury refinement and aggressive performance. Constructed entirely from corrosion-resistant T304 stainless steel, this system is built to withstand extreme thermal loads while maintaining a lifetime of consistent finish. The engineering team focused heavily on "Sound Engineering," ensuring that while the exhaust is louder and deeper than stock, it remains completely free of interior cabin drone—a critical requirement for the high-end M5 experience. With its direct-fit installation and a variety of 112mm quad tip finishes, this exhaust provides a surgical fit and a premium upgrade that complements the caliber of the world’s most powerful M-sedan. Key Features: USA Fabricated: Hand-made in Miami, FL, using precision TIG welding and master fixtures for a guaranteed fit. Daily Driveability: Tuned for a clean, sophisticated idle and low-drone cruising, ideal for long highway trips. Advanced Material Science: T304 Stainless construction offers superior heat resistance and long-term durability. Inclusive Hardware Kit: Includes all clamps, gaskets, and valve motor brackets required for a seamless install. Enhanced Visuals: Quad 112mm dual-wall tips are designed to resist heat discoloration and fill out the bumper cutouts. Specifications: System Type: Valved Full Catback Exhaust Tubing: Mandrel-bent for zero-turbulence exhaust gas flow Valve Operation: Independent remote-controlled electronic valves Performance Gain: +20–25 lb-ft torque (Estimated) Vehicle Fitment: 2025+ BMW M5 (G90 Sedan and G99 Touring) Tip Options: Brushed Stainless Matte Black Carbon Fiber
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For over 40 years, Active Autowerke has been at the forefront of BMW performance, and the G4X M240i axle-back exhaust represents the pinnacle of that development. This system is constructed entirely from TIG-welded 304 stainless steel, offering maximum resistance to corrosion and heat cycles. Unlike universal systems, this exhaust is engineered specifically for the G42 chassis, ensuring that every hanger and flange aligns perfectly. By retaining the factory valve control, this exhaust offers a "no-compromise" solution: it stays quiet and sophisticated when you need it, but opens up for maximum volume and performance when you want it. Each kit is a comprehensive package, providing all hardware required to transform your M240i’s rear section. Key Features: Surgical Precision: Every unit is test-fitted on a dedicated fixture to ensure zero-clearance issues with the chassis or diffuser. Premium Materials: Full 304 Stainless Steel construction ensures a lifetime of performance. OEM Integration: No need for extra wiring or controllers; works seamlessly with your car's computer. Aggressive Rear Stance: Fills the rear bumper cutouts more effectively than the stock rectangular tips. Performance Gains: Improved exhaust scavenging contributes to a more responsive B58 engine. Specifications: Type: Valved Rear Axle-back Exhaust Section SKU: 11-125 Finish: Brushed Stainless (Standard) Hardware: Includes all high-grade connecting hardware Vehicle Fitment: * 2022+ BMW M240i / M240i xDrive (G42 Chassis) Custom Options: Available in multiple tip finishes to match your specific trim package
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For over 40 years, Active Autowerke has been at the forefront of BMW performance, and the G4X M240i axle-back exhaust represents the pinnacle of that development. This system is constructed entirely from TIG-welded 304 stainless steel, offering maximum resistance to corrosion and heat cycles. Unlike universal systems, this exhaust is engineered specifically for the G42 chassis, ensuring that every hanger and flange aligns perfectly. By retaining the factory valve control, this exhaust offers a "no-compromise" solution: it stays quiet and sophisticated when you need it, but opens up for maximum volume and performance when you want it. Each kit is a comprehensive package, providing all hardware required to transform your M240i’s rear section. Key Features: Surgical Precision: Every unit is test-fitted on a dedicated fixture to ensure zero-clearance issues with the chassis or diffuser. Premium Materials: Full 304 Stainless Steel construction ensures a lifetime of performance. OEM Integration: No need for extra wiring or controllers; works seamlessly with your car's computer. Aggressive Rear Stance: Fills the rear bumper cutouts more effectively than the stock rectangular tips. Performance Gains: Improved exhaust scavenging contributes to a more responsive B58 engine. Specifications: Type: Valved Rear Axle-back Exhaust Section SKU: 11-125 Finish: Brushed Stainless (Standard) Hardware: Includes all high-grade connecting hardware Vehicle Fitment: * 2022+ BMW M240i / M240i xDrive (G42 Chassis) Custom Options: Available in multiple tip finishes to match your specific trim package
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For over 40 years, Active Autowerke has been at the forefront of BMW performance, and the G4X M240i axle-back exhaust represents the pinnacle of that development. This system is constructed entirely from TIG-welded 304 stainless steel, offering maximum resistance to corrosion and heat cycles. Unlike universal systems, this exhaust is engineered specifically for the G42 chassis, ensuring that every hanger and flange aligns perfectly. By retaining the factory valve control, this exhaust offers a "no-compromise" solution: it stays quiet and sophisticated when you need it, but opens up for maximum volume and performance when you want it. Each kit is a comprehensive package, providing all hardware required to transform your M240i’s rear section. Key Features: Surgical Precision: Every unit is test-fitted on a dedicated fixture to ensure zero-clearance issues with the chassis or diffuser. Premium Materials: Full 304 Stainless Steel construction ensures a lifetime of performance. OEM Integration: No need for extra wiring or controllers; works seamlessly with your car's computer. Aggressive Rear Stance: Fills the rear bumper cutouts more effectively than the stock rectangular tips. Performance Gains: Improved exhaust scavenging contributes to a more responsive B58 engine. Specifications: Type: Valved Rear Axle-back Exhaust Section SKU: 11-125 Finish: Brushed Stainless (Standard) Hardware: Includes all high-grade connecting hardware Vehicle Fitment: * 2022+ BMW M240i / M240i xDrive (G42 Chassis) Custom Options: Available in multiple tip finishes to match your specific trim package
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For the owner of the new G90 M5, the Active Autowerke Signature Catback System offers the perfect balance of luxury refinement and aggressive performance. Constructed entirely from corrosion-resistant T304 stainless steel, this system is built to withstand extreme thermal loads while maintaining a lifetime of consistent finish. The engineering team focused heavily on "Sound Engineering," ensuring that while the exhaust is louder and deeper than stock, it remains completely free of interior cabin drone—a critical requirement for the high-end M5 experience. With its direct-fit installation and a variety of 112mm quad tip finishes, this exhaust provides a surgical fit and a premium upgrade that complements the caliber of the world’s most powerful M-sedan. Key Features: USA Fabricated: Hand-made in Miami, FL, using precision TIG welding and master fixtures for a guaranteed fit. Daily Driveability: Tuned for a clean, sophisticated idle and low-drone cruising, ideal for long highway trips. Advanced Material Science: T304 Stainless construction offers superior heat resistance and long-term durability. Inclusive Hardware Kit: Includes all clamps, gaskets, and valve motor brackets required for a seamless install. Enhanced Visuals: Quad 112mm dual-wall tips are designed to resist heat discoloration and fill out the bumper cutouts. Specifications: System Type: Valved Full Catback Exhaust Tubing: Mandrel-bent for zero-turbulence exhaust gas flow Valve Operation: Independent remote-controlled electronic valves Performance Gain: +20–25 lb-ft torque (Estimated) Vehicle Fitment: 2025+ BMW M5 (G90 Sedan and G99 Touring) Tip Options: Brushed Stainless Matte Black Carbon Fiber
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