The Gran Turismo Rally event that you're stuck on of course
Well, the Delta S4 can be a handful to drive so use the C4 if the Delta is too hard to drive
Use a Delta S4 which you win in the Gallardo Event/Lamborghini Exclusive (I know it's one of those two) or a Citroen C4 won by golding all Loeb events. You'll need to have eagle eyes to drive in the dark in the Delta though
Well at least the P4 doesn't have (afaik) shoddy handling like my RM Camaro (and all best parts installed)
Maybe I should have used a RM Challenger but I already won the event and that stratos is great!