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So far, all of the changes to make Mustangs into Roush Mustangs that we’ve shown have to do with appearance, interior and chassis upgrades. This section of Roush Performance’s build facility in Livonia, Michgan is where Roush’s performance is added. The heart of the Stage 3 Roush Mustang is a Ford Coyote 5.0 liter V8 that has been bumped to 575 HP. The engines are dropped from the cars, an Eaton twin-vortex R2300 supercharger is installed, along with an intercooler of Roush’s own design, and then reinstalled in the car along with assorted other components. Each engine is worked on by a single technician, who signs a plaque in the engine compartment. If 575 HP isn’t enough, Roush also offers the “Aluminator” Ford Racing engine package, which has yet another 100 HP, with a more robust lower end, aluminum intake manifolds to match the aluminum heads and the production aluminum block. The 11:1 compression ration engine Aluminator has forged aluminum pistons for Mahle that are hard anodized with Graphal low friction coating, premium Manley H-beam forged steel connecting rods with ARP 2000 bolts, BOSS 302 high performance connecting rod bearings, and BOSS 302 valve springs along with an eight quart oil pan with a windage tray.