They can be hard on them, but i dont think it will actually ruin one? If you let a car idle too long with pullies, your volts can sink donw, the alternator being spun slower, thus making the alternator not as powerful, the street pullies shouldnt hurt, the "race" ones will drain your battery at an idle.
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formerly known "90dpscoupe"
5spd 90lx, 3.27grs, BM fan, alum divesahaft, ADS chip, 160 stat, mac coldair fender, mac h-pipe.
Best e.t-13.91
60'-1.9 (on 225/60/15 firehawks)
mph- 98.70
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