popping and backfire

[hlknvlcn60]

On my Vaquero is the V&H chrome pro 2-1 system, bolted on tightly with new crush gaskets. Also on the bike is the Cobra FI2000R pro auto tuner. I have the Roaring Toyz big air kit installed. The hose that used to go into the sotck right side intgake box is now plugged off like the Thunder kits,same as, and the little nipple on the back of the front cylinder coming off the aluminum colored little box has the little breather-filter hanging from it between the jugs. RacnRay agrees with this. I still get bubbling on decel and the occasional "pop" but strong acceleration. There must be a way to rid all decel popping on the 17's.....hoses a-plenty coming off the back of the front cylinder. Time to get back into the shop manual and explore the complex fresh air recirc system for answers.