Hey Xenn, i have been messing around lately with alot of cars and you were right about them arcade mode rally cars, they are just modifed versions from there stock counterparts. (Performance wise) I have managed to find out exactly what parts the some of the rally cars have, as matter of fact here's the list of parts right here for anybody trying to model the rally cars just like from the arcade disc.
*Saxo Rally Car"
1st the buy the Citroen Saxo 1.6i VTS
Move to the top of your garage list by pressing start, then use this body code for the rally body
801CD5E4 D1D8
801CD5E6 1035
Racing Muffler
Sports Brakes
Brake Balance Controller
NA Tune Up Stage 2
All Drivetrain
Racing Suspension
Dirt Tires
Any parts not mentioned here are not needed.
More to come!