I'm running right at 600 fwhp and also running a set of 315/35/17 M/T ET Street drag radials (second pair). They're fabulous from a dig and quite frankly, due to their 35 series aspect ratio, pretty damn good in the twisties too. DO NOT get caught in the rain with them (or any drag radial for that matter) unless you've got a death wish.
It really could handle another 100-150 HP though, as it's starting to feel a bit S-L-O-W again..
