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I am also in CA and have the Dinan catback pipes. Small HP bump, great sound compared with stock, well worth it. FWIW, I wouldn't dream of getting a cosmetic twin exhaust setup. For a start, would there even be a compatible diffuser?
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2015 BMW 228i M Sport w/Track Handling Package
DAP | Lighting | Premium | Tech
DINANTRONICS Performance Tuner Stage 1 | DINAN Shockware | DINAN Free Flow Exhaust | DINAN Performance Spring Set + Ride Quality and Handling Kit |