The t1 class are cars mostly cars whit mostly stock and the things they need for the rally like modfied suspension setup bigger fuel tanks etc.
And the t2 class cars are purpose build cars for cross country rally's
highly modefied engines supension setup lightend etc.
Most cars in the t2 are losely based on production cars but have things like carbon bodyshell lighters doors
I believe this the street version for mitsubishi pajero evo rally version
perfect car for the is something like the pajero evo or other cars
Here are few links of the techinal regs for the t1 and t2 class
The bowler wildcat as used in the rally.