i have a spec c set up same as you, the car had the hks turbo 28 35 in it, with stock spec c clutch in it and its held it fine for ages, doesnt slip, and its still in the car now. still going good and that was on 335 hp. but if u wanna change it, id say the stage 3 exedy clutches that mao has at evo r would be very good. and i think theyre something like 1200 installed or something which is very good.