find some stock 16" wheels off of a zx3. they are a bit lighter. also pick up a summer tire liek the dunlop direzza 101's a set of starspecs might give it away as cheating a bit,lol.
besidses you'll never really get up enough heat to warrant using star specs on most small courses. ive had no grip issues with my direzza 101's on my stock svt wheels.
also a neat trick would be to pick up the frpp dampers from ford and re use the stock svt springs. its all black so it'll look factory. i think there might be one or two tricks but its not really necessary. a stock svt will autocross pretty well, the best thing to do is run it for 2 or three seasons and figure out what yo uwant to do to improve upon it.
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