I have the Stillen pulley because I WANTED 20% under driven... Mike at NST will make you one if you NEED NST... But in all honesty if you or your installer is component, there is no risk in running it... I've had it for 3000 miles now, and it feels great, I MIGHT down the line order a 10% overdrive for the alternator from Mike@NST, but as of now I don't see any reason
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