If you're into racing, chances are you've heard the name Roush. Originally founded as Jack Roush Performance Engineering in 1976, Roush has become one of the most successful companies in motorsports, winning everything from drag race to road race and Winston/Nextel Cup championships. In 1995 Jack Roush founded Roush Performance, a division of the company that specializes in performance parts and vehicles for enthusiast buyers. With an extensive background working with the OEMs, Roush has been able to bring factory-grade quality and engineering prowess to the aftermarket performance business. In 2004 Roush jumped into the supercharger game, launching its positive-displacement, Eaton-based RoushCharger twin-rotor blowers for the '05-'06 Mustang and '04-'06 Ford F-150. With all the essential hardware included, plus a specifically calibrated Roush PCM, these kits are among the most refined in the industry. In fact, Ford backed them with a three-year 36,000-mile warranty as installed on new Mustangs and F-150s, marking them as the first and only supercharger kit that comes with a Ford-endorsed warranty.
Since then the RoushCharger lineup has been expanded to included an intercooled version of the truck blower (designed for '04-'08 F-150 trucks), plus further variations on the Mustang kit. These included an uprated supercharger kit that comes with an air-to-water intercooler, plus a polished version of the same basic kit. In late 2007 Roush announced tweaks to the RoushCharger. A smaller 73mm pulley was added, along with improved PCM electronic calibrations, resulting in a bump of 30 hp for a total of 445 hp and 418 lb-ft of torque when installed and running on an '05-'09 Mustang GT engine.
At the 2007 SEMA show in Las Vegas, Roush revealed the P-51A, a limited-production Mustang with an aviation theme. At the time, it was also the most powerful Roush Mustang ever built, packing 510 hp thanks to reworked engine internals, new calibrations, and a new version of the RoushCharger-the 2300. Since then this upgraded blower, named for its capacity which features more advanced four-lobe rotors and a high-flow inlet tract to improve overall efficiency, has become available as an over-the-counter item. It comes as a complete kit, with upper and lower intake manifolds, 52 lb/hr injectors, a low-temperature radiator, dual 60mm throttle body and special fuel rails, and 52 lb/hr injectors. It is also the first RoushCharger that can be shipped without Roush-specific PCM calibration, allowing buyers to install custom tuning calibrations on their engines when equipped with this blower. It is possible to gain from 510 hp to 700 hp with the 2300, which also comes backed by a one-year warranty.