I had Rinehart slipons installed last summer along with a Power Commander III and an SE airbox. My bike runs OK, but backfires and pops on decel and between shifts! I HATE that. Dealer says that's "normal". I've seen other bikes with this setup and they sound much better with no popping. What do you think the problem is? Oh yeah, 2007 RKC. BTW, my bike makes a "chirp" when I shut it off. Sounds like a bird "chirp". I only hear it when I shut the bike off though. Could it be an exhaust leak, and could that also cause the popping?