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More Boost. More Power. Tweak your boost levels with this GripTec "upper" LSA pulley upgrade for your LSA supercharger. The stock LSA blower came on 2nd gen Cadillac CTS-Vs and 5th gen Camaro ZL1s and this bolt-on upgrade allows you to change the spin-rate of the supercharger. A GripTec upper pulley upgrade is a cheap and effective way to boost power. NOTE: This is the PULLEY ONLY. If you need a hub for this pulley use this one or select it as an add-on to this pulley. NOTE: The 2.35" pulley requires snout modification to fit. The 2.40" pulley should fit most snout castings and the 2.45" pulley fits all stock snouts. ZPE (the company behind the GripTec pulley system) has their own mounting "hub" (the ZPE hub) that's required to use this LSA pulley. If you already have the ZPE  hub you can simply buy a pulley by itself. Otherwise you can buy a hub separately or select it as an add-on with this pulley. The hub comes with a set of 10 titanium screws for weight savings and strength. Patented Pulley Power The GripTec pulleys are made from billet 7075-T6 aerospace grade aluminum which is Stronger and harder than 6061-T6. What makes these LSA pulleys really shine is the "GripTec" technology that's applied during the machining process. GripTec is a micro-machining technology that allows for maximum grip force to be applied to the LSA supercharger pulley without damaging your blower belt. More importantly the GripTec technology essentially deletes belt slip on the blower allowing all of the crank's power to be transferred to your blower via the pulley. Frequently Asked Questions Q: Do I need a hub?A: Yes, you will need a ZPE hub specifically for GM/LS/LT applications. Q: Which pulley size is right for me?A: It depends, check out our LSA pulley guide for some guidance but talking with your tuner about your overall build is a must when doing mods like pulley changes. Q: Do I need a tune after installing this pulley?A: Yes. While it may "work" out of the box to get the most of