I have a 05 Chevy avalanche 5.3L vortec L59 with ported truck intake opened exhaust ports shorty headers K&N CAI was tuned by Hoosier tuner but now i have started upgrades went to sloppy stage 2 cam with new pushrods, lifters, springs and roller rockers. have decapped flow tested 78 lb injectors and i have the 76mm turbo ready to get mounted but going to leave it off for now having problems im not sure what is going on it backfires and seems to not have anywhere near the power it should.