I have a Cat sec in my 99 MX6. I had it machined by Hitech (machined spline into clutch). It is also equipped with the ER kit and a straight 47 helix. Yoiu will have to move your engine over some. I have a Sled Pro alignment tool and moved the engine over the equivalent of three thick and one thin AC clutch shims (sec spacers from AC dealer). I am also running HC`s. Seems to work well although I am still working on final calibration. should have all ready this weekend.
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