I've been considering the crumb cup mod. The crumb cup is made to fit in your sink to stop stuff from going down the drain. Some bikers have found that fixing the crumb cup inside, covering the exhaust hole, lowers the decibels of your exhaust. You can screw them into the muffler or use high temp silicon.
My 2 into 1 Thunderheaders are super loud when the engine is cold, but seem just right when hot. My new job has employee parking in an underground security garage and all the car alarms announce whenever I leave. Thunderheaders don't have baffles inside, and they end with a large reverse cone/air scavenger that puts the actual exhaust hole about 7 inches deep inside the end of the pipe, which makes the crumb cup installation tricky. Any advice?
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