I have a Spec Stage 3+ clutch and their new steel flywheel being installed this coming weekend in my XI.. I could let you know how it is once I am through breaking it in. My clutch finally died after 108,XXX miles. lol
I will also write a review once I get it all broken in.
2007 e90 335xi
Cobb Tuned e85 50/50, AFE Intake, VK Catless Downpipes, Spec Stage 3+ SMFW, ER CP w/ TIAL, Vanguard Exhaust (Custom Fit