Active Autowerke BMW M3/M4 (G80/G81/G82/G83) Valved Rear Axle-Back Exhaust

Give your G8X M3 or M4 the voice it should have had from the factory. The stock exhaust on this platform is famously restrained, quiet where it should be aggressive, and lacking the character enthusiasts expect from an M-badged car. Active Autowerke's Axle-Back Exhaust changes that completely, delivering a deep, purposeful growl that finally does justice to the S58 underneath.

Designed in the USA and built from high-grade SS304 stainless steel, the system retains the factory valve actuators, so you keep full control over volume exactly as before. Drive quietly around town when you want to, then open the valves and let the S58 announce itself properly. It's a genuine bolt-on upgrade, engineered specifically around the G8X's factory mounting points rather than adapted from another platform.

This axle-back is also the entry point into Active Autowerke's wider exhaust system for the G8X series, built on over 40 years of developing parts that improve both power and driving enjoyment. Paired with their GESI midpipe and downpipe, the combination delivers the strongest sound and performance gains available for this car. The axle-back alone already transforms the exhaust note noticeably, but if you want the valves-open sound to genuinely turn heads, adding the midpipe and downpipe makes the biggest difference of all.

Why Choose This Axle-Back Exhaust

• Designed and engineered in the USA specifically for the G8X platform
• Built from high-grade SS304 stainless steel for genuine long-term durability
• Retains factory valve control, quiet for daily driving, aggressive on demand
• Guaranteed direct fitment for all G80/G81/G82/G83 models
• All necessary mounting hardware included
• Pairs seamlessly with Active Autowerke's GESI midpipe and downpipe for the complete sound and performance package

Compatibility

• BMW G80 M3 Sedan (2021+)
• BMW G81 M3 Touring (2023+)
• BMW G82 M4 Coupe (2021+)
• BMW G83 M4 Cabriolet (2021+)