Sorry for the OT reply, but just the usual reminder you'll get 100x in a thread like this:
On the track last week in a LapBattle event, I beat an 800 WHP GTR rather soundly and a few newer Porsches by a smaller margin. And I took second in my class to a very old E36 M3. A veteran racer was one second behind me in a naturally aspirated early 90's miata, and I was surprised he didn't beat me.
Until you've been at it for a while, how much time you spend at the track will do a lot more for your times than improving the car's power to weight ratio.
Brakes were mentioned already, but if you're new to this stuff, one other thing is if you put R comp tires on one car and street tires on the other, the car with the R comp tires will win the race if the cars and their drivers are in the same ballpark. And running R comps burns up money really fast.
Of course, the bigger question is how much and how intensely do you intend to do things like drag race or road race. If you only want to do that a few times a year, forget track performance and get the car that's the most fun on the street or looks and feels coolest to you. You'll be happier, honest.
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