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I haven't read all the replies in this thread but the general argument is clear. There's definitely no agreement as to if they damage or don't damage the engine, whether down the road or whatever. Engines are getting more complicated than they used to be. On my old car (1995), installing an after market pulley was the best bolt on I did. No problems ever heard of. Definite gains. Indisputable gains. The butt dyno tells it all. Whether or not it causes damage to the crank, or other aspects of the engine is beyond my understanding. Maybe one day I'll research it. Because I'd love to have one if they are 100% safe.
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