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According to Stillen, "Up to 80% lighter weight than stock steel and up to 10% lighter than other aftermarket pulleys, we’ve seen power gains of up to 10+ HP at the wheels."
I didnt' mean that's what u said, trying to quote stillen
Gotcha. I read your thread awhile back when I was considering them. If I have some extra money laying around in the future I might do it for the hell of it.