I have the Unorthodox Racing underdrive lightened crankshaft pulley and it really made a difference. No fooling the computer, no premium gas, works all the time. I can actually drive with the a/c on now without being completely left in the dust. No problems with battery charging and I do have a sub w/ amp. Engine cooling is not affected. It did require new belts but my old ones were shot. It is approximately a 20% underdrive plus it is much much lighter allowing the engine to rev up faster.
Retail is like $200 but is a much higher quality piece when compared to the afx or others. The unorthodox pulley allows the original outer ring to be removed and replaced with a special race only ring that only has provisions to drive the alternator. Oh and you can get it in colors if you are into engine compartment details.
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www.cardomain.com/id/rallydrock
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