Where'd you find that GT mod? Right now I'm using the SportsCarPack mod with the LeMans, Sebring, and Zandvoort tracks from
http://www.rsdg.net for F1 2001. Combined, those rsdg.net mods make a product in and of themselves. I don't think I've ever driven F1 2001 as it came in the box since installing the rsdg.net mods. Those guys really know how to make a sim.
The only downside to using a mod is that the damage isn't reflective of the car shape, but that's a concession I'm willing to make in order to whip the Cadillac LMP around Sebring.