r888 medium compound is you tire and will last enough too, comes in 315/30/18 and will be sticky even at 700+ whp, go upgrade your turbos now

 

i have 335/30/18 r888's on 12.5 wide rears, once they are fully warmed up on warm day, they are amazing. Cold pavement might scare you a bit though.

 

Just went with a set of Nittos after replacing my Hankook TDs. Have to say the TDs were pretty good although they only had a 295 out back. Still pulled some respectable lap times.

 

For a RWD set up, the Nitto NT01 245/40/18 and the new 305/35/18 is an awesome set up that won't break the bank. The 305/35s provide much better grip and handling than the same brand 315/30s I ran before. Unlike the R888s, the NT01s are good all the way to the cords and can be flipped side to side since they are not unidirectional.