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YO! If there is anything that is worthwhile, its actual real-deal dyno tuning with wideband O2 sensing. That is what your S-AFC is for, and you should definetly use it. I have a friend who recently got his Mustang dyno tuned; he went in the shop with 245HP to the wheels, left with 308HP. Nothing but changing his air/fuel curve and timing. The shop my buddy went to charges $225 for 3 pulls with wideband O2 sensing, then $100 an hour for tuning, for however long it takes. So I'd guess your Z might take 2-3 hours to tune, and $350ish is very worthwhile. Trust me! ;-) Rob
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