What kind of racing allows you to change the engine but not the rear end? If you think you are really going to get 200HP, then yes, 205 or 225 would be the tire of choice. How exactly are you going to get 200 HP in a TR7? Buick V6, Rover V8, turbo? You still don't want to go bigger just because bigger is better. Don't loose site of the fact that it is a small light car. Whatever brake option you are looking at not only sounds expensive, but it is overkill for a 2000 pound car. You will have a very very hard time finding wheels bigger than 15" in the stock bolt pattern. Stock TR8 brakes will wo that thing down over and over all day long. Minimum race weight in my TR8 was 2610 pounds. The brakes worked hard, but never let me down. Use some Capri, Volvo, or BMW calipers calipers up front just because pads are much cheaper. You can convert the stock rear end to disc brakes if you want to spend money. You need to figure out how much you want to spend and then figure out what the most cost effective way to going fast is within that budget. The stuff you are talking about wanting for this car costs more to do than going out and buying a decent TR8. What is your budget? By the time you cage the car, buy safety equipment, a couple sets of wheels and tires, bigger brakes, modest suspension goodies, you are already bouncing off 10 grand. I'm about to build another cage in a TR8. Just the materials are going to cost $700. If I had to pay someone to build it, I could expect to pay another 2 to 3 grand.