I know he redrilled the flywheel. I think they are 250mm from what he told me. IF you do a search on Dial-a-clutch you can see what I'm running. It's rated at 103% greater than stock holding power for the 82&83 turbos. Right now I'm at about 330 crank HP and I love it. Easy to drive and very firm feeling. The test I use is if my wife can drive it. With a lightened flywheel and this clutch she has no proublems with it. If you can get the flywheel lightened while your at it. You'll be glad you did. I personally don't recommend the puck style clutchs. Yes , they hold the power but, they suck for everyday driving in my opinion.