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Ben makes good points. I have a fast forward performance underdrive pulley and I am pretty sure it was directly responsible for the keyway on the crankshaft shearing which resulted in piston/valve contact. It did go 90,000 miles before that happened though. After installing I did not notice what you could call a large hp gain but the throttle response was quite a bit crisper. Was that worth the initial expense of the part? possibly. Was that worth the blown motor and headache to pull it and rebuild? The only reason I would say yes is that it resulted in the purchase of a cam and a more aggressive build on the car. Other than that, definitely not. I would not purchase one again.
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