I have a customer running an 305 RE-11. He still spins first and will spin half way through second but it hooks up top. He is making roughly 420whp using the stillen kit last time we tuned.
Other sticky tires to put on your list RS-3 from Hankook, Z1 StarSpec from Dunlop, and the Continental DW isnt bad just not as good as the big 3 I mentioned prior. Toyo R888 is sticky as well. The biggest problem with the super sticky tires is youll get maybe 2 summers worth of use out of them lol.
Good luck finding something to hold the power!
Thanks,
Alex Goodwin
AlexG@motionlabtuning.com