I've wondered the same thing, I've always kept my ol' chevy's EGT's at or below 1100 deg. Can the PS take higher temps? Fresh in my mind, 'cause I also just got a DP Tuner, and hit some high EGTs goin' home the other day, around 1250, backed out of it quick, but I'm sure it hadn't been there for more than a few seconds... but it's good to know that people who run 'em say it's ok to hit higher than that for a while and not worry about harm...