I am getting an 883R later this winter and will be doing the Buell heads and 1200cc kit. How does the stock 2 to 1 pipe perform? The guys at the local HD shop say I need a Thunderheader to get the thing to run. I don't want a loud bike. Nor do I want to spend anymore money than I have to. What about just changing the muffler on the stock pipe? The TECH at the local dealer has done these same mods to his Sportster and claims 94HP on the dyno(with a Thunderheader) I would think I should be able to keep it in the 80's with stock 2 into 1 883R pipe????