Jim, I have a single turbo car that DMC Houston put in about 10years ago. Warren said it was on of the fastest they knew of at the time. All I know is they said it was 200 hp +. The engine was tore down and new pistons installed. I also just put a new clutch disk, pressure plate in my daily driver car and it's only 9 3/8" disk. I don't know how long it will hold up if the car is hot rodded a lot. But the mechanic that helped me said unless the bell housing is changed along with the flywheel there wan't much more I could do. The Centerforce clutch set up was discussed on the group a week or so ago and I think pretty well determined that the stock Valeo clutch set up was about the same. I have resolved to leave my De Loreans as original with the exception of modifications and if I want power, just look at the new Camaros. 325HP stock street legal $29,000.00. The D's were just not made for it.We just have to face it. You can see the Valeo clutch set up on my site under drive train. Just a thought John Hervey http://www.specialtauto.com/