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Crank pully Weight reduction is how we are able to increase horsepower. Each pound of weight removed from the crankshaft worth approximately 2.7HP and the gains jump even more dramatically with forced induction, nitrous, VTEC and increased RPM's. Only 15-200Io of the gains form our pulleys come form underdriving. The diameter of each of our crank pulley is reduced up to 200Io. We fully maintain all accessory output minimums like air conditioning efficiency, power steering feel, and voltge even at idle with everything electrical an in the car. There are no adverse effects from using any of our pulley versions. Bolt them on and forget about them, then just follow your vehicles normal maintenance schedule. The second type are our crank pulley which are available in 3 versions. First is the underdrive crank pulley in standard belt alyout. They drive all the accessories that were available in the car from the factory. This version is up to 2D0Ia smaller in diameter. But more important is they are 6D-900Io lighter than the BEM pulleys they replace. It's another reason why we do all of the underdriving at the crankshaft pulley to maximize the reduction in weight on the crank. Second are the stack diameter crank pulley, also in standard belt alyout. It is designed to maintain alternator output at stock levels for car owners with big stereos or for audio competitions where system voltage must maintain specified levels.For cars with superchargers it maintains the original level of boost form the aftermarket supercharger kit. Third are the single belt conversions. This version was designed to drive only the alternator or alternator and water pump. It is used for engine swaps or far the racer where only the alternator is being used. This version has the same percentage of underdirving as the Ultra or Tuner S version but is 90- 95% lighter than the OEM pulley it replaces. P/NO DESCRIPTION CARTON PACK cp.9001 honda h22a 10 cp.9002 honda b18 10 cp.9003 honda accord 10 cp.9004 honda civic fd06 10 cp.9005 nissan s14/s15 (3pcs/set) 10 cp.9006 nissan rb20/rb25 10 cp.9007 nissan z33 350z (3pcs/set) 10 cp.9008 mitsubishi evo123 10 cp.9009 mitsubishi evo789 10 cp.9010 subaru impreza version 789(2pcs/set) 10 cp.9011 toyota supra v6 3.0/jza80(3pcs/set) 10 cp.9012 toyota mrs/cellica 10 cp.9013 mitsubishi 4g93 10 cp.9014 toyota vios 10 cp.9015 ford mustang 10 12