Hey Steve, the only mod I have with cup physics is the Dirt 55 mod but here is all I did and it seems to work fine. Remove the fast.gtp.jag - fast.gtp.maz - fast.gtp.sau - fast.gtp.toy and fast.gtp.sim files and put in the fast.cup.sim and qualify.cup.sim from a regular Nascar 2003 track. Both tracks need to be the same to get the right setup. Here's a screenie of me runnin' the Dirt 55 mod with cup physics at Watkins Glen GTP track. You could use the same procedure with cts physics too, I guess.
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