Biggest upgrade in time is, and will always be, a big sticky tire. Aero, Diff and motorsports grade ABS round out the top 4. I run anywhere from a 275 to 315 Hoosier A on 11's. The diff is a custom set-up OSG. You can build a 370 or 350 to outrun a 991.2 (as it sits on the showroom floor) for a single lap for less than 50-60k including the price of the car. It will be fragile and a car that is not going to be ok to drive on the street, however.
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