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All I know is this:
Stage 1--Good upgrade from OEM, handles up to 400 HP
Stage 2--For cars with moderate upgrades, power adder (kevlar disc)
Stage 3--Available with Ceramic or Carbon will handle 500+hp, Ceramic will hold 600+
Stage 4--For vehicles over 600 hp, not recommended for street use
I am debating between the Stage 2 and Stage 3 along with an aluminum Flywheel
I'm doing heads/cam so I will be at ~430 flywheel, I will probably spray after I get use to the H/C power ~550 flywheel. Is the stage 3 the type of clutch that can come on gradually or is a "on/off" type? Is there a difference in streetability between carbon or ceramic?
I ran a stage 3 with my steel single mass flywheel and their pressure plate. It held the car great, drove fine, but rattled at low rpms (< 2000). I pulled it for that reason alone and put a McCleod Street and strip clutch in that I had laying around with 70 miles on it. The McCleod is pretty quiet, but will not hold my power, especially under Nitrous. I would however rather the clutch slip than break parts so it is a trade off. Hitorically, I have put a new disk in about every 9-12 months, or 3-5k miles. I kept the stage 3 disk in case I wanted to go all out again at the track and use the ET Streets again.
I know Chad had some real bad luck using the stage 3 with the aluminum flywheel, but I think the problems were more towards the flywheel not staying together.