Just looking at the S vs R, if you add some of the options to the S like 13" wheels, black pack, carbon seats and then take off the 1k you save as you don't need to add window/doors that leaves the cost extra for the R at 3600 ish, from what i can see you get for that is the 6 speed sequential, race suspension the aerofoil wishbones. Assuming Ive added it up correctly.