Okay here my problem when im at 4500 rpms trucks stops pulling and breaks up,its sounds like golf ballz in a coffee can,ses light starts flahing when i let off light goes out .so i replce my plugs with tr55 gapped at .60 and slapped some msd wires on problem still there i check my oil and it smells rich like gas so im looking around go underneth truck and can here a knock at idle on drivers side so grab a screwdriver and hold to header all good hold to block all good hold to cat or collecter and walla loud ass knock tap collecter and knock goes away for like 30 sec then comes back WTF.I have no hp tuners or edit so i cant moniter,so made a app at dealer on tue.Im sure they say headers caused it and screw me.Anyone know where i can buy a collector-cat and where i can get the flanges for my header,I looked at gm parts direct and looks like they only sell whole y pipe setup with both cats,so im sure thats what dealer does to replace and since i have lt headers im sure they will say im screwed.and im sure just beacuse they will reflash my comp and there goes my tune.Any help woud be greatly appreacited.
2003 Z71 Avalanche----93 tune by Nelson- Pro cold air induction-Azsm long tube headers-Magnaflow catback-Trans go shift kit-B&M tranny cooler-160 t stat
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