Dearborn, Mich. -- Automotive legend Carroll Shelby visited Ford World Headquarters on Tuesday, September 14th, and received a full report and briefing on the Shelby GT500KR project. He also received a seat-of-the-pants update in a development test mule at Ford's Dearborn Development Center. During the test session, Shelby discussed the vehicle's progress with Eric Zinkosky (right), a Vehicle Dynamics Technical Specialist from SVT, Ford's Special Vehicles Team. Shelby GT500KR suspension, tire and vehicle tuning will continue through the fall, with production expected in the spring. Nearby, also in Dearborn, engine work continues. The supercharged 5.4-liter V-8 engine is expected to deliver 550 bhp, making the Shelby GT500KR the fastest production Mustang ever build. Pricing of the new, limited-edition KR, which was unveiled this past spring at the New York International Auto Show, has not yet been confirmed.