Update. It is an exhaust leak caused by warped flange by my Berk HFCs. I installed thicker gasket material (hand cut) but I think I'm going to have to remove the cats and have them machined flat so that the gaskets can seat/seal
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09 6spd Berk CBE, JWT cams, ZSpeed CSC, Stillen (25 row oil, brake cooling, sways, gen3 CAI), Passport (9500ci), Quaife LSD, Z1 400 hp kit, ss lines, pads, rotors, clutch etc, Phunk's pan and fuel starve fix
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