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how bad is this with a 2.5



I wouldn't even try it. Your risking alot. Way more heat from the additional friction of metal to metal, and you'll wear them out pretty quick since metal doesn't slide over metal very easily without any coating on it.
 
you might loose a psi or two. 2.5 pulleys pretty pointless aswell. Run more timing on the 2.6 or 2.7. The 2.5 is past the threshold of diminishing returns
 
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the meth kit is not what caused the coating to come off. aslong as your not running the detergent windshield fluid ur fine. its a coating flaw from factory, keep the meth get new rotors.
 
Meth doesn't harm rotor coating...I don't know why you keep saying it does...WATER will damage and peel the coating off of GenIII rotors because GM didn't use decent coating from the factory. They fixed that on the GenV which is why you never see any set of GenV rotors peeling/flaking/polished. I bet if you threw a good set of rotors in your car would knock from the 2+ psi of boost you'd be getting.
 


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