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Enhance Performance B58 decat downpipe for M140i and M240i

  • Sale
  • £399.00
  • Regular price £449.00


  • Designed and manufactured inthe UK
  • T304L stainless steel construction
  • 102mm CNC Machined inlet flange
  • Argon back-purged TIG welding
  • 102mm/4″ bore tapering to meet the OE system
  • Brushed and de-burred piping
  • Precision TIG welded o2 bungs
  • OEM-style fitment
  • Lifetime warranty


Please note: This downpipe is not MOT compliant and may cause the engine management light to illuminate. A JB4 or alternative stage 2 tune is required to code out the fault code for cat efficiency.