Roush performance is moving quickly with their new 2009 Roush P-51B Mustang. The 510 horsepower P-51B Mustang will be it’s most exclusive Mustang yet with only 51 models being produced. The Roush P-51B will only be available in coupe form with a 5-speed manual transmission and Vapor Silver paint. With the limited run of 2009 Mustangs Roush is already taking orders through Roush authorized dealers. Roush will be building the P-51B Mustangs in October with a November delivery date. MSRP for this limited edition Mustang is said to be in the neighborhood of $61K. Pictured above is the P-51A Mustang but you can pretty much get an idea of what it will look like.