Like I told you on PM's i ran the spec steel on my spec 3+ and didnt like it. Clutch tore up right away too. I put a spec twin disk with an aluminum flywheel and its much better. Id go aluminum, plus wiht the power you are making you will be fine. There will be chatter with that clutch, but most of it will go away. Once you start making power, there really isnt a clutch that wont chatter or be on/off.