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Originally Posted by Dave04Mustang you can do whatever tune you want for octane. Mine has 3 I have a 87 performance, 93 gas mileage, and 93 performance. For the rear yeah 7.5 stock gears and transmission is auto. Stock or modified means is you car stock. If you don't have the O/R H pipe yet don't install the tune until you install the midpipe (if you end up listing that as your exhaust). The muffler depends on the kind of mufflers you get but chances are you will just be getting mufflers. Since you really haven't done any mods yet I would hold off on buying this

well i plan on ordering 4:10 gears and a T-lock but i suppose i can do that later down the road as soon as im done with all the other stuff. Also, thank you for the Reply to the thread