I got my wifes quad(raptor 350) an fmf pipe and I got it and put it on. It was popping on decel so I got a bigger pilot jet and now it's still popping? Not as bad but still is popping. I checked for air leaks at exhaust and all but nothing. Checked the gasket at header and it's good . No other leaks but jetting should be fine? Ps I know I'm in the bike forum for a quad but the guys there are slower to respond and a motors a motor so you guys should be able to help me out.