Da Groj

If a car is DS it runs in S4 and I assume if it is modified it would be DSP or our M3 class correct?

Nope, stock classing has nothing to do with modified classing.

While stock classing has nothing to do with Mod classing, A DSP car does go into M3.

But, every S4 car doesn't end up in DSP. (Miatas, for instance, go to CSP... which is M2)

Is there a reference list for mod class, so I can figure out where this potential new car may run? I know it is DS for stock.

On the classing page on our website where it's always been.

It's not super-current with new cars. Let me know if the car you're looking for is not on the list.