The Dodge Viper SRT-10 from NFS Carbon.
No custom handling, here's my vehicles.ide line (uses Banshee handling):
viper, viper, car, BANSHEE, BANSHEE, VEH@LOW, NULL, 10, 999, 0.2967, 0.2967, 0, 5, 1.0 ,0, ext_strong
Known issues:
Doors don't work properly (NFS Carbon doesn't have properly seperated door models, so only the outside part of the door moves)
Detached/moved components reveal huge holes in the car mesh (NFS Carbon's cars weren't designed for IV's damage model)