I recently bought a used 2002 yamaha vstar with cobra pipes on it. When I first got the bike it ran great and the exhaust sounded good. A few weeks ago a backfire issue came out of nowhere. Now whenever I decellerate or engine break I get a bad backfire that sounds like a bunch of gunshots. The bike runs great besides that. No loss of power or anything like that. Just the backfire. At first I thought the jets needed to be synced. I brought it into a shop and had them sync the jets. They said the jets were a little off so they synced them and that should take care of the problem. Well it was just as bad the minute I drove away. So then I talked to a buddy who had the same bike and said i needed new jets put in since the cobra exhaust is probably causing me to burn too lean. So now I brought it into a different shop that is a little spendier but I wanted it done right this time. Told them my issue and they agreed that I was probably burning lean. They called me back and told me my bike is burning perfectly. His exact words were that people spend a lot of money to get a bike to burn like mine. So it is not running lean but I am still getting a bad backfire. The guy at the second shop said that it is the cobra exhaust causing it and that I need an exhaust with a little more back pressure. What does everyone else think? Could it be the exhaust itself and if so what are some reccomendations for exhaust on a V-Star besides Cobra?