I doubt the Excels are rated to 650*C as the DS2500 are rated to 550*C+. I got that figure from the distributors as there is no clear answer anywhere on the interwebs. (not aimed at you NuGen)When shopping for pads the main spec you need to look at is the coefficient of friction, μ (pronounced mu) as that is what provides the friction. A higher temp range is only needed when the pads are glazing. Ah... yeah maybe I'm wrong about the Excel's peak temperature. But yeh I wouldn't recommend them at the end of the day either. It's a shame manufacturers don't make this information more clear.