Hey gang, I just recently put a pair of cycleshack pipe, SE Stage 1 air cleaner and power commander on my 08 Street Bob... everything has been fine...then...over the past couple of days it has been backfiring at start up. It wont do it every time...but most of the time. I have to laugh, cause the first time it happened, it caught me so off guard that I literally jumped a few feet. It sounded like someone fired a 45 at me. Anyone have an idea why this might happen? And could this happen if there's an exhaust leak.(they were out of the regular exhaust gaskets, so I picked up a pair of the screamin eagles...which I heard weren't very good) Any help would be much appreciated.