Here is something I know for a fact. White gauges only have the "Turbo S" on the tack.

As fas as performance difference, the Turbo S has all of the GT2 goodies that make that too a faster car than your average turbo. Weight, my car weights close to 3800 (cab version).

I believe mine performes well because of the way I break in my P-Cars.

Yes, since I am Italian, I will take the Lambo and F430. Love the cars but I have owned P-cars since I was 18 years young (now 47).