Please search the GT5 Drifting Forum for tunes. A good choice for RWD drift cars is any of the premium BMWs. The M3 Coupe '07, Z4 M Coupe, and M5 are my favorite ones.
Trying to drift like Ken Block with a 4WD car isn't going to attract a lot of positive responses on multiplayer. You are better off learning to drive RWD cars as 4WD drive so much more differently than RWD.