VMP Tuning - 07-11 Mustang Shelby GT500 VMP Ultimate Pulley Tool with 2.59" supercharger pulley & 90MM idler Includes 'stock look' or 'aftermarket look' VMP 2.59" pulley (select above). Includes a black 90MM idler pulley that replaces the factory 75MM idler. This larger idler takes up the belt slack and provides better belt wrap. In our experience, an auxiliary idler bracket and pulley is not necessary, but can still be used with our pulley. Our idler uses a bearing that is the same brand & size as the OE bearing, we have found that a single bearing is sufficient when a proper quality of bearing is used. Tuning and CAI required for 07-09 cars, 10-11 with factory CAI will benefit greatly from tuning when installing a smaller pulley. Aftermarket plugs not required. Features: •Our 2.59" pulley is the smallest in the industry for max boost & HP •3-4psi increase in boost •Fits 07-11 with stock blower and Ford Racing TVS Blower Upgrade Kit M-6066-SGT •Fits the 605HP Super Snake Benefits: •VMP is the first to offer an aftermarket GT500 pulley made to OEM specifications •One piece steel design for the ultimate in strength and durability •The bore of our pulley is precision machined, just like OEM pulleys, for a precise stock-like press fit