FWIW I compete in a lot of hillclimbs, as close to touge racing as you'll get. My car has headers, no cats, E85, coilovers and a 4.67 diff (extra torque for hills is a must for a touge car surely) . It's in full road trim and is competitive with most things with two doors and 2000cc, including a few Elise's, Integra Type Rs, S2000s, and Miatas, and BMWs.
My advice would be to focus on performance mods with data to justify them. Start racing and get as much seat time as possible, and for the love of God leave VSC in sport mode when you're on public roads.
Oh yeah, and a six-point harness is a bad idea unless you have a head restraint of some type.
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