Slipped on an arrow exhaust the other day on my z750. Midpipe and exhaust only. Now when i roll off throttle it backfires quite consistently. I've read that it may mean i have a lean mix or an air leak in the exhaust system. I remembered that when i slipped it on i didn't use the lube that it came with because it went on no probs.......just wondering aside from lubing is it also meant to seal it? I just worry bout the backfiring doing damage in any way? Should i solve the problem with a power commander? or is there any other way?