lol good cause ull spin those 315s still, my insanely fast bad ass trans am with full exhaust blewww 275s off! but then again we are talking 314rwhp NA bitch! wayyy to much powerzzz lmaooooo i heard dynos take more kindly to street tires, they dont stick to the rollers as much as stickies and radials tend to take a beating on rollers, buttt in your case it might be good to prevent tire spin on dyno? idk son!