E9X M3 Signature X-Pipe with Hi-Flow Catalytic Converters

Active Autowerke SKU: 11-018


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This exhaust system was designed and engineered to work with most after-market exhaust systems/mufflers on the market today without the need to cut, weld or modify anything. It is a true bolt-on that can be performed by most.

This system uses a free flowing 100 cell high flow catalytic converter.

Active Autowerke is able to improve on the factory X Pipe design by a scavenging effect that yields high horsepower gains. Dramatic weight savings are also gained when one compares the factory system at 40 lbs and the Active Autowerke Signature X Pipe weighting at a mere 25 lbs. Noticeable gains have been measured on the Active Autowerke Mustang Chassis dyno with a 12+ RWHP when adding this X Pipe to our Signature exhaust system and as much as 10+ RWHP when used to the BMW stock exhaust.

The Active Autowerke X Pipe system is constructed of 100% 304 polished stainless steel and has a industry standard warranty against rust. This latest addition to the Signature line up is a must for the true Enthusiast looking for performance increases.


  • Free flowing 100 cell High Flow Catalytic Converter
  • Durable Polished 100% 304 Stainless Steel
  • Increase of 10+ RWHP
  • Completely Bolt on with Factory Style Flanges
  • Weights 25 lbs. versus the heavy factory 40 lbs.
  • No Cutting Required 
  • Install to all systems that use factory style fitting
  • Two year warranty