I have both Pullies. Stillen Crank and Under Drive. Was given to me by a friend. But skeptical about installing these units. Think I'm going to install the main crank for now. I dunno about changing belts and going with the UR Pullie.
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2010 Solid Red Z: Mods: Stillen G3 Intakes | BC Coilovers | H&R 20/25 Spacers | Stillen Splitter | Stillen LW Pullie TBI | Red GTR Start | LED Interior | Kenwood Double Din 
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