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One thing the folks at Kenne Bell are not scared of doing when we work with them on dyno projects is making serious power. And, of course with a supercharger, boost is the key to achieving horsepower goals. Our test group of pulleys includes a 3-1/8-inch (included with the Blowzilla 2.1-liter system), 3-inch and 2-7/8-inch wheels, which are available for $69 each. We started with the largest wheel, and closed our project with the 3-inch piece. The smallest pulley would undoubtedly yield ridiculous power, but we held off bolting that one on the virgin engine. Changing blower pulleys is an easy proposition, but the job requires using Kenne Bell's proprietary pulley wrench (PN SC3140).