The most important single system in a high power mid engine car is the gearbox. The two really big deals are the gear ratios, and a limmited slip.
Without going into them deeper, just be sure you are completely versed on why you want the gear ratios that are in the box and what type of limmited slip is in it. The information on both of these issues are all here in the gearbox page.
I personally really like the Quaife that is in my GT40 and the regeared ratios that make it a true 5 speed.
The other thing to do right the first time is the clutch. Add 50% to you target torque and install a clutch to cope with the higher number.
PUT A FIRE SYSTEM IN THE CAR!!!!!!!! A small fuel fire will destroy your $100K toy in less than a minute. On high presure FI engines, I would add a fuel pump cutoff switch that turns off the pump if the car hits something hard enough. Frankly all cars should have one. Mine will, even with a Holley on it.
Power..........5 to 1 power to weight ratio is enough. 500 hp in a 2500 pound car is FAST!!!! Any extra money in the budget should be spent on brakes and tires. Think Frans #1 SLC. MUCH quicker than the rest, many with 100s of hp more. It's all about the grip baby!
I would get the adjustible anit roll bars on a SLC track car from Fran as well as a cage that included door bars. Also get the race areo parts. spliter, wing, fender vents for a track car.
On a street car think about the spring lifts for the front.
OH.....on a track car do a nice cheap paintjob. Couple of K$ or less. If you put a $10K + paintjob on a track car you will wish you didn't. On a street car think about that clear coating plastic stuff that covers the paint on the front of the car. For that matter why not do it on both. That stuff really saves the paint on a low car like a GT40 and others like a SLC.
