Hey guys, put a Supertrapp slip on exhaust on a 2011 Sportsman 500 …. It was from a RZR but made it work …. Bike sounds and runs great just found out when on the throttle full tilt and you let off it backfires a lot. Changed out the plug, same issue. I’m going to assume it’s running lean? I was told no jetting required after swapping them out. If jetting is required does anyone have some specific info on what is required vs trial and error?

:ugh2: