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Keeping the flap opened will make it louder on cold start.. Just look up golf tee mod on the e9x platform. If it's too loud now don't ever get a downpipe because it will make it even louder.. On my e92 I had catless downpipes with a full catback exhaust and on cold start it was loud enough to resonate through the whole house and in public garages was loud enough to set off alarms haha
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