Active Autowerke BMW M3/M4 (G80/G81/G82/G83) Signature X-Pipe Midpipe

The G8X M3 and M4 have received rave reviews for their performance, but the sound has always been the letdown, muffled enough to leave drivers wondering if they're really behind the wheel of a genuine M car. Active Autowerke's Signature Midpipe with X-Pipe takes a different engineering approach than their Single or Equal Length midpipes for this platform, improving on the restrictive factory design by increasing flow and removing the two sets of factory resonators entirely.

The X-Pipe design creates a genuine scavenging effect between the two exhaust banks, yielding modest horsepower gains alongside the sound transformation. It ships in two configurations to suit your driving needs: with secondary cats retained (delivering slightly reduced exhaust volume and a slightly deeper tone), or without them for maximum flow and the fullest sound. Constructed from 100% 304 brushed stainless steel with an industry-standard warranty against rust, it's part of a complete exhaust system for the G8X, alongside a rear axle-back valved exhaust and a set of GESI catted downpipes. Installation requires only a single cut in the stock midpipe (some sourcing notes two cuts, confirm exact install requirements with your supplier), remaining a bolt-on that most can perform.

Why Choose This X-Pipe Midpipe

• Genuine scavenging effect between exhaust banks for modest horsepower gains
• Available with or without secondary cats to match your preferred sound character
• Removes the factory's two restrictive resonator sets for improved flow
• 100% 304 brushed stainless steel, industry-standard warranty against rust
• Bolt-on installation, stock midpipe reinstallable if needed
• One of three distinct midpipe options for the G8X, alongside Single and Equal Length designs

Compatibility

• BMW G80 M3 Sedan (S58)
• BMW G81 M3 Touring (S58)
• BMW G82 M4 Coupe (S58)
• BMW G83 M4 Cabriolet (S58)