High Flow Cats help
ok, so figured out i had blocked cats. they would glow red hot when i drove. pretty bad. so i gutted the 2 front ones, cut the rears off and put on high flows, put the rear o2 within 6" of my rears. is THIS enough to change my tune? truck already has gibson exhaust, headers, tb, electric fans, 4.10 gears, fresh transmission, new upper intake manifold, plugs, etc.
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