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Re: S2000 vs. STi
For Spec Miata, the rules basically require 15x7 wheels, Eibach sway bars, 700 lbs/in frontand 325 lbs/in rear Eibach springs, Bilstein shocks, and a sleeve type coil over kit that you can buy for about $1200. In most divisions in the US, the Toyo Proxes RA-1 tire is required. They are definitely not the fastest cars to drive, but we're seeing fields of 35+ cars in the northeast US, and the racing is very close, and relatively inexpensive.
My Miata is basically completely stock except for a roll cage, fire system, brake pads, tires, and exhaust. It's very restrictive on what you can do.
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2004 Subaru Impreza WRX STI (daily driver) 
1999 Mazda Miata (track car, slow, but finished the SCCA Runoffs)
1987 Porsche 944 (being rebuilt)
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