Weighing in at just 10lbs, this revised crankshaft pulley will remove over 12lbs of rotating mass over the factory 22lb 2007 GT500 crankshaft pulley. Designed by Ford engineers, it has the proper harmonic characteristics for the engine as well providing all the benefits of reduced rotating mass such as slightly improved throttle response and less stress on the front end of the crankshaft. Highly recommended for all GT500 owners, especially if you plan on increasing boost on the factory supercharger or upgrading to a larger supercharger. Fits 2007, 2008, 2009 GT500 M6312SVT$295.00 www.realspeedauto.com Ph.631-563-7325 All parts listed are for the Ford Mustang unless otherwise noted. Copyright 2018 Realspeed Automotive Inc. All rights reserved.