I just tried a Ford Falcon XR8, and I found out though it has 250kg &110 more weight & horsepower than GT500 cars, it handles really well, on racing softs & no tuning I had a 6:26 on Nordscheleife, faster than my NSX-R LM RC & most of the JGTC GT500. I've never actually driven any Super GT cars in this game yet, and GT500 cars are largely disappointing to me; they should have much more downforce as in the real life. Remember that the king of FIA GT1, MC12, cannot match their speed in corners!