I'm using the Mosler MT900-Rs with some modifications to get rid of the canards and front splitter. Also the cars have quality, though it's weird that their tire wear and fuel are MILES better then the rest of the grid lasting the entire race, hints why you see the red one in front of the pack.
However, I've made a mistake in doing that and should've put the car behind the GT1s. I just ignore that and be thankful to even have them. I could also modified their fuel so they can pit more often, but I don't count them I'm just having fun right now.
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Also their was more G2 cars IRL, but I didn't bother to put them in. We have the 350z, I just didn't bother making the #179 and as for the Monaro, I could just either use a Pontiac racecar or use the V8 supercar as a grid filler, but there was no point for me, I have a full grid of cars and that's all that I've wanted.
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No they run different categories, the Mantis runs GT3, N-GT. Mosler and Vertigo run G2. BMW Z4 ran for G2 in it's first test session, kind of GT3ish. The Ultimas ran in GT2, GT3/N-GT, but it does depend on the body type.