good info, thanks. i'm new to EFI and wonder if I can just put on new pipes w/o tuning. i really just want the sound and could care less about max power gains. As long as the engine is running efficiently, I'm happy.
any clips of the backfire sound? I thought a backfire was caused by unburned fuel getting past the exhause valves? YouTube - London Bikers Shooting Pedestrians (Exhaust Backfires)