look for exhaust leaks. my dealer replaced o2 sensors to no avail and it was just leaky HFC gasket. Z1 sells a all metal one that seems pretty good for about 45 bucks.
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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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