Whats a ballpark starting point for spring rates? Will be running imca with a 604, 8" spoiler, and D55 tire. The car we just bought is a 2015 and im guessing the setup guide that it came with might be a little out dated. Any help is appreciated, thanks.The Guide that came with the car suggests this:LF-500 to 600 RF-325 to 375LR-200 or 225 RR-250
