NSX-R is fastest stock car on many circuits in GT5. In trial mountain 300Hp NSX-R is about 2s faster than stock F430 challenge.F430 had terrible understeer problems on some corners and i have check this again. NSX-R currently the fastest stock car i have driven in trial mountain.
update: NSX-R was on sports soft tyres. After tyre switch to hard, ferrari was 1s faster.