This Scorpion F20/F21 M135i Cat-Back System runs from the downpipes-back to remove the secondary cats. This significantly optimises exhaust flow and is a great way to add to the visual and aural experience.


For a full turbo-back system combine with a Scorpion M135i Sport Cator De-Cat Downpipe. This system bolts directly to the OEM system and uses factory mounting locations. Optional black ceramic tailpipe finish gives a great stealthy look to the system.


  • 76mm (3″) piping
  • 9.7bhp gain with this system alone (no mapping)
  • 13.1bhp gain when used with Sports Cat (no mapping)
  • 13.8kg weight saving with this system
  • 15.5kg weight saving when used with Sports Cat
  • Dual 90mm Daytona tailpipes




  • Rear silencer
  • Rear pipe
  • Centre pipe
  • Front link pipe
  • Fitting kit

Scorpion Cat-Back System for BMW F2x M135i

Tail Pipe Option
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