I've had a Stillen Lightweight Pulley (standard size) in my Z for a while and I do notice it revs a bit quicker.. Also, you can feel the difference when decelerating; engine feels "lighter"..
As of right now, I'm getting installed a UR lightweight alternator pulley as well.. I don't expect to feel any major difference from this mod though..
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2010 Solid Red 370Z * Touring-Sport-6MT * Black Interior
Performance: STILLEN * BERK * UR * MISHIMOTO * K&N * Z1 * ZSPEED * UPREV * DBA
Interior: GT-R Red Start/Stop Button * MSA Floor Mats * PW:JDM
Exterior: INGS+1 * SEIBON * FUJIMURA * PW:JDM * UAM * KICS * VOLK
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