All i can say is do your research first...see if anyone in your area has the clutch so you can drive it or at least ride in the car. I have the original design SPEC stage 3 carbon in my WS6(used to be in my SS before I upgraded to the RAM). I have heard that SPEC has since re-designed their Ls1 clutches...thank god. A lot of guys had issues with the old design, I did. My very first SPEC blew to pieces at 400 miles, during break-in on the Goodyear Eagle F1s. Luckily I had a VERY experience performance trans shop install it and they verified there was NO abuse at all(the flywheel had no heatspots or anything, just the disk fell apart). The shop contacted SPEC and explained everything; PSEC sent a brand new replacement and asked for the broken clutch to be returned to them. Once they got my old clutch back they called and applogized; saying they have not had that happen yet. They also said there were no signs of goul play or abuse, just a fualty part. Now, had I installed it myself, i probably would have been up shitcreek without a paddle. Anyway, when I sent my SS to Rapid Motorsports for the H/C and 12 bolt I had Mikey install a RAM clutch instead. since the SPEC only had about 700 mles on it I kept it and had it put in my Ws6 since it's stock clutch was getting really weak. It seams to hold ok but it's been making some noise lately and the pedal has been stocking to the floor(either a return spring or hydros). I personally would go with a RAM910/402 VDS clutch system if I were you. It has EVERYTHING you'll need: billet flyweel, clutch disk, pressure plate, throw-out bearing, brand new slave cylinder and brand new GM adjustable master cyclinder.