My Dinan catback exhaust sounds very beefy without being obnoxious and raises the fewest possible red flags for service/warranty purposes. I'd be careful about these more radical suggestions if all you want is a less anemic exhaust tone. For some of us (not all, by any means) life is too short for warning lights, unpleasant smells, problems with the service department and/or breaching emissions regs if they apply in your state.
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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
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