The rear tires are just regular T8 Super Soft Racing Tires from the RSX and the front tires are T5 Medium F1 tires.
heres what I did to the RSX to make it good.
give it the evo5gsr engine, civic sir2 chasis, and F1 car FRONT tires. than just put everything else regularly tuned all the way. then just change the downforce lines (assuming you use mks: lines 292-296) to 0 and the tire grip (lines 356-360) to 101. then load up the game and test out the settings and all that good stuff. but I did find that using F1 car front tires on FF's make it accelerate faster