There's not much more room in a 4 door than in a 2 door. It really isn't a people mover.
Anyway, I've done 1:15 at wakefield (with cheap shit street tyres) and around Eastern Creek one day I was all over a modified rex around the twists and then he left me for dead on the straight. He obviously had more power than stock but pretty sure his suspension was standard still. I caught him by turn 3 or 4 every lap but the bastard wouldn't let me pass. Come the straight, same story, off he went.