This Dual Belt Phase 1 2005-2009 Mustang Supercharger Kit brings total power to 475 hp and 435 lb-ft at the flywheel for 2005, 2006, 2007, 2008, and 2009 Mustang GTs with the 4.6L 3V V8 engine.
This 2005-2009 Mustang Supercharger Kit is part of a new and innovtative line-up of Mustang superchargers. ROUSH has termed this line as their "Phased R2300" superchargers. The idea is that you can buy in at a Phase 1 level and build up power at a later time with upgrade kits to upgrade to a Phase 2, thereby reusing some of the components that you've already purchased. This is a great option for those who want power now, but want to wait to upgrade to the higher levels of power (and cost).
Another innovation in this line up is the option of belt FEAD systems. There are two options: single belt and dual belt. The single belt option comes at a lower price. However, the dual belt FEAD option (another ROUSH innovation in itself) provides more robust management of power. This is because the stress of the FEAD system is literally spread over the two belts instead of one -- you have less individual belt length which means less stretching in the belts. Please note that although you can upgrade the Phase of one of these superchargers, you can not upgrade the FEAD belt option (you have to stick with what you started with).