The official 2013 RTR upgrade for the Ford Mustang has been released, and unlike previous upgrade packages from the World Champion Drifter Vaughn Gittin Jr., this year's package - available at all US Ford dealerships - sees power increase up to 624bhp.
Vaughn is said to have worked with experienced chassis engineers to create 'one of the most impressive handling and fun-to-drive Mustangs out there'.
Subscribe to evo magazine
There are two packages on offer, the Spec 1 - which adds the full styling kit, Ford Racing springs and performance exhaust - and then there's Spec 2. This adds adjustably dampers, uprated anti-roll bars, rear strut brace and the option of 525 or 624bhp supercharger systems. Spec 1 costs $6250 (£3984), and the Spec 2 is from $11,995 (£7646).