Modified Physics for a street stock

So, some of you may have seen my post about trying to make an online matchmaking service, I am looking into this more, I think I have found a small problem, cup cars in nr2003 are too hard to drive to for the average person, online racing with random people would become a disaster.

So i am going to set out to make an exe for a street stock. However I don't really know what I'm doing. I want to build a car that can run almost flat out at 1.5 miles and can me manhandled around a short track. Basically something with like 300 or 400 hp and alot of grip.

Basically something that's fun to drive and easy enough for most people but not too easy.

Any tips from physics guys?