but GT4 already had the GT500
No, GT4 had the GT350, GT2 had a GT350 and GT500.
And it could need a lot more vintage Mustangs.
EDIT: And no, there werent two winners:
2009
"Best Domestic Automobile": Nicholas Ashby / Moment Carbon Camaro
"Best Asian Import": Chris Rado World Racing Unlimited / Front-Wheel-Drive Time Attack Scion TC
"Best European Import": KC Howet / 2009 Underground Racing Lamborghini LP560-4TT
"Best Hot Rod": Philip Koenen / "Trans-Cammer"
"Best Truck/SUV": Scott Bailey and Tony Vanillo / Ford F250 Unlimited 2 Class short-course race truck
2008
"Best Domestic Automobile": James Shipka / 1967 Chevrolet Camero Rally Sport "Big Red"
"Best Japanese Import": JR Rocha / 2007 Infinity G37
"Best European Import": Robert Gal / Volkswagon Concept car
"Best Hot Rod": Jason Lavigne / Factory Five Racing 1933 Hot Rod
"Best Truck/SUV": John Wargo / 1938 Chevy
2007
"Best Domestic Automobile": Gary Cheney; 2007 Factory Five GTM
"Best Japanese Import": Michael Chung; 2007 Nissan 350Z
"Best European Import": Marcel Horn; 2007 Audi TT
"Best Hot Rod": Jim and Mike Ring; 1967 Ford Mustang Fastback
"Best Truck / SUV": Mike DeFord; 2007 Dodge Ram
2006
"Best Domestic Automobile": Tajai Das / 2006 Pontiac Solstice
"Best Japanese Automobile": Leigh Guarnieri / 2007 Honda Fit
"Best European Import": Don Nicholson / 2008 Volvo C30
"Best Hot Rod": Craig Morrison / 1960 Chevrolet Corvette
"Best Truck / SUV": Daryl Klassen & Mike DeFord / 2006 Hummer
2005
"Best Domestic Automobile": Marc Gerisch / 2006 Ford GT
"Best Japanese Import": Stephen Papadakis / 2004 Honda S2000
"Best European Import": Marcel Horn / 2006 Volkswagen Jetta RGT
"Best Hot Rod": Alan Johnson / 1971 Barracuda
"Best Truck / SUV": Jonathan Ward / Toyota Land Cruiser
2004
"Best Domestic Automobile": Jeff Tetzlaff / 1966 GT40
"Best Japanese Import": Mark Mendoza / Mitsubishi Lancer Evolution VIII
"Best European Import": Marcel Horn / HPA Volkswagen R32
"Best Hot Rod": Craig Morrison / 1955 Chevrolet 210 Sedan
"Best Truck / SUV": Brett Garner / Ford F-250
2003
"Best Domestic Automobile": Michael Jackson / 2003 Saturn Ion
"Best Japanese Import": Craig Wilson / 1992 Acura NSX Coupe.
"Best European Import": Werner Funk / 2001 Renault Clio Sport
"Best Hot Rod": Ted and Sue Richardson / 1962 Buick Special
"Best Truck / SUV": Dustin Whipple / 2004 Ford F-150