I have a stock Ls block and head, Si clutch, and JDM SiR pistons (10.4:1). I'm getting a Cable trans form a junk yard along with the harness and axles. Does any one know if I could use this clutch? Its a ACT HD with 3000 miles on it and I would hate to throw it away. Also What gain do you think I should get from the pistons over the 9:1's. Its all going into my hatch if your wondering. Thanks for the help.