You obviously haven't done any research on the topic. Under-drive and/or Lightweight pulleys both have unique advantages while Harmonic Balancers prevent vibration that can lead to crankshaft failure and/or fusion with the pulley. Feel free to educate yourself on both topics and I won't waste time explaining. It doesn't always happen but it's a chance that I choose not to take bc this is a universal issue when choosing an aftermarket pulley. Crankshafts even break in LS engines from the same thing if someone doesnt want to spend the extra $$$ on a fluidampr. The last pulley that I saw for sale was taken down bc the owner said "it would not come off".
VIDS :: JAY.mp4 video by GTMPOWER - Photobucket
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09 Black 7AT Sport, UpRev, Koni, Swift, Whiteline, Motordyne XYZ, Stillen HFC/Exhaust, Stillen 25 row, Pioneer, Infinity
Last edited by ben1620; 10-21-2012 at 12:21 AM.
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