I used the '08 WRX STI 5-Door tuned to 344hp. Dirt and Snow were a breeze. Tarmac was much tougher, and I'm not sure why. Possibly because I tuned to drift the slower corners and it ended up slower. The Intermediate races (5 stages) were much harder than the Expert (8 stages.) For expert I just up'd the horsepower on the already glorious Rally C4 and flew through the races- no drama.