RTR is basically the same rules as stock, but without R-compound tires (Hoosier A6, Kumho V710, etc)
RTR = Road Tire Rear (wheel drive)
RTF = Road Tire Front (wheel drive)
RTA = Road Tire All (wheel drive)
Must run OEM springs
You can run Double adjustable dampers as long as you retain the stock spring perch and upper mount
Front OR rear sway bar may be replaced with different size, but not both
any cat back type exhaust that you want
any wheels AS LONG AS you retain diameter and width within +/- 6mm offset (spacers can be used to attain that offset)
....other than that everything else is illegal, coilovers, headers, etc are illiegal UNLESS it was a factory option (eg GT3 comes with coilovers)
If you know of any cars in serious question of the rules, let me know and I can take care of it. I know people :lolguy: