I agree with bads1. I work at a shop and removed the stock muffler, replaced it with a race muff, race ecm, and k&n filter and then added a dobech performance tfi mod. I've never seen a engine trouble code thrown in over 1 1/2 years. Even with the tfi mod I can't totally remove decel pop, but it runs better throughout the entire rev range. It also sounds a lot meaner.
well right now i have it still plugged in with the cable off the bike. in a few weeks when i get the race ecm i'll try to remove it.