MAYES wrote on 06/04/08 at 18:54:57: Hey everyone, I recently replaced my, very loud straight pipe w/ no baffels, with a Harley Sportster muffler. The problem is, now it seems to quiet.
Anybody have any ideas on how I may make it a little louder and deeper without taking out the baffels?
I did this to my Harley Dyna muffler. I used a 12"long, 5/16" drill bit. While the muffler was on the bike, I placed the drill bit into the output end of the muffler, contacting the baffle. Drill one hole at the 6 o'clock position. Ride the bike. If you want it louder, drill another at the 10'oclock position. Louder still, drill another at the 2 o'clock position. If you change your mind later and want it quieter, use a ratchet with a long extension and a socket to fit a short 3/8" Lag bolt, and screw it in to one of the holes you drilled. I settled on 1 hole in the baffle.