I have a 2001 Honda Shadow ACE 750 that makes a popping sound in the exhaust whenever I decelerate. I've only had the bike for a couple of weeks and haven't ridden in about 25 years so I don't know if this is normal. It's not on the level of backfiring but it's pretty steady and somewhat annoying. I'm just wondering if this is normal or if it's something that could eventually result in engine damage that I need to have checked out. It has Cobra pipes installed on it and otherwise seems to run just fine. Anybody have any thoughts on this? Thanks.