Ford Mustang Roush 427R - S-197 I - 5th Gen (2005 to 2009)

The ROUSH 427R package introduced in 2007 was based on the Stage 3 package and included all of its suspension, handling and performance modifications. It lacked the rear fascia and rectangular exhaust tips that were deemed excessive by some enthusiasts. An upgraded ECM (electronic control module) in the 427R generated 435 hp and 400 lb-ft of torque from the 4.6L V8 and made it more powerful than the previous Stage 3. Instead of the traditional racing stripes, the 427R was identified by a “hockey stick stripe” appearance package. For the 2008 model year, Roush offered a Trak Pak option which was a special performance package. It includes a comprehensive suspension upgrade with adjustable front and rear shocks, springs, stabilizer bars, jounce bumpers, and adjustable camber/caster plates. The package also features 18-inch forged alloy wheels with high-performance tires, a three-piece aerobody kit (front fascia, chin spoiler, and hood scoop), and various interior upgrades. Only 100 of these Trak Pak models were produced, making them quite rare.