I had a Spec Stage 3 6-puck no problems with it but it was aggressive. I would say more track than DD even though I did drive it on the street regularly.
Right now I have a Competition Stage 5 on my DD no problems. This clutch has a smoother engagement than my Stage 3 Spec.
Oh yeah I had an F1 clutch at one one point it held but when I took it out after maybe 300 miles (since i was building my motor) bits of the pads were falling apart.
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