Our stock pressure plates are rated at approx 1000 ft lbs. A Spec PP was a bit more than stock, and a Clutchmasters PP is rated approx around 1600 ft lbs. I currently run a stock PP and flywheel, with a 4 puck ceramic disk, and its just *barely* holding a good 15 psi. Not too bad considering its just a disk upgrade over the stock organic disk material. From the research i have done, it looks like the Clutchmaster's plates have the highest clamp load out there..That, along with many people's claims that it has held 500HP without issue almost makes it a good fact that their PP's have that 1600 lb of clamp load.