Nonostante la lista completa dei veicoli disponibili in Forza Horizon non è stata ancora pubblicata ufficialmente, i fan non si arrendono e ne stilano una tutta loro, basandosi sui veicoli visti nei vari trailer rilasciati.
Alfa Romeo • 2007 Alfa Romeo 8C Aston Martin • 2012 Aston Martin Virage Audi • 1983 Audi Sport Quattro Bentley • 2012 Bentley Continental GT BMW • 1973 BMW 2002 Turbo • 1991 BMW M3 E30 • 2008 BMW M3 E92 • 2012 BMW M5 F10 • 2011 BMW 1 Series M Coupe Bugatti • 1992 Bugatti EB110 SS Cadillac • 2011 Cadillac CTS-V Coupe Chevrolet • 2010 Chevrolet Corvette Grand Sport (With top down) Dodge • 1969 Dodge Charger???? Ferrari • 2009 Ferrari California • 2010 Ferrari 458 Italia • 1957 Ferrari 250 TR • 2011 Ferrari 599 GTO • 1995 Ferrari F50 – Alternative image • 1964 Ferrari 250 GTO Ford • 2005 Ford GT • 1970 Ford Mustang Boss 409 Gumpert • 2010 Gumpert Apollo Sport Honda • 2005 Honda NSX-R GT Lamborghini • 2010 Lamborghini Murcielago LP670-4 SV • 1988 Lamborghini Countach LP5000 QV Lancia • 1974 Lancia Stratos HF Stradale – Alternative image Lexus • 2010 Lexus LF-A Lotus • 2006 Lotus Exige Cup 240 • 2009 Lotus 2-Eleven Maserati • 2010 Maserati GranTurismo S Mazda • 2010 Mazda MX-5 Superlight • 1997 Mazda RX-7 FD Mercedes-Benz • 2009 Mercedes-Benz SL65 AMG Black McLaren • 1997 McLaren F1 GT Mitsubishi • 2008 Mitsubishi Lancer Evo X GSR Nissan • 2002 Nissan Skyline GT-R V-Spec II R34 • 2010 Nissan 370Z Mosler • 2010 Mosler MT900S Pontiac • 1977 Pontiac Firebird Trans Am Radical • 2011 Radical SR8 RX Renault • 1980 Renault 5 Turbo • 2010 Renault Megane RS 250 • 2009 Renault Twingo Sport Cup Saleen • 2004 Saleen S7 SRT • 2013 SRT Viper Toyota • 1998 Toyota Supra RZ Traffic cars • ???? Audi A4 Avant • 2004 Chrysler PT Cruiser • 2011 Ford SVT Raptor • 2010 Ford Taurus SHO • 2011 Toyota Prius • ???? Toyota RAV4 • ???? Toyota Camry • 2004 VW New Beetle Planes • P51 Mustang