Z check your tune, do you datalog? I have seen a few Z's get way off from the target afr... mine became pig rich, was shooting insane flames, and was down about 15whp from a few months prior... re-tuned and got it right back.
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09 370Z 6M PW - FBO Best 1/4 mile = 12.926 @ 109 SOLD -- 08 BMW 135i - FBO 12.1@120mph SOLD -- white 09 e92 335 Coupe Mtech - 11.9 @ 119 :-)
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