I thought I'd add one more tid-bit of info. I've had my Powerslots for almost two years. Not once have they squeaked or squealed. I don't know if that is common with all slotted rotors, but it is nice to say the least.

99 Black SVT -3L Hybrid w/.5mm overbore, Spec clutch/flywheel, MSDS, BAT intake, K&N open, 17'Konig Tantrums, DMD, Opt. TB & Y, Powerslots, Bassani w/ magnaflow res. 96 SE MTX- "The War Wagon" "I'm in love with my car..." -Queen