BMW 1-S
before: BMW 135I Muffler Bypass, Regular $150 or Stainless $200
after: BMW 135I Muffler Bypass, Regular $150 or Stainless $200
before: BMW 135I Muffler Bypass W/ Y-Pipe Tip, Regular $250 or Stainless $300
after: BMW 135I Muffler Bypass W/ Y-Pipe Tip, Regular $250 or Stainless $300
2009 BMW 135i PE MOD $460
2012 BMW 135i Exhaust Resonator Bypass W/ Y Pipe, Regular $250 or Stainless-$350