Id say either the Evo or the Skyline, and of course, the Honda's
Evo- The New PRUVEN autosports Evo is the fastest evo on earth at something like 11.???@127? MPH dun remember the exact time. Adn it looks completely stock from the outside. So that goes to show how much potental is hidden in that beast.
Skyline- This car is like the standard for japanese performance companies just for its sheer power and torque, and AWD. and you can easily double its HP with a couple of bolt ons.
Honda- Civic, Tegra, and so on. Just because damn, go to any car part site and look. Thee will be more parts for honda's than anythign else. There are so many parts for one of these you will never see 2 of the exact same (unless they were made to look alike)