Szárnyra keltek a pletykák, hogy egy egész sor új autó kerülhet be a Forza Horizon 4-be, például a Rolls-Royce Wraith, a klasszikus BMW 650 Csi, vagy az 1980-as Lotus Esprit Turbo.
A teljes gyűjtemény most nyilvánosságra is került a GT Planet által, hála a játék forráskódjában kutakodó felhasználóknak. Olyan finomságok vannak itt, mint a Hennessey Velociraptor, a Mercedes-AMG Hammer, vagy a 2014-es Tesla Model S.
Nem is szaporítanánk a szót, íme a lista:
| 2018 Ferrari Portofino | 1987 Mercedes-Benz AMG Hammer | 2019 Raesr Tachyon |
| 1988 Mitsubishi Starion | Zenvo TSRS 2019 | 1988 Volkswagen Scirocco 16v |
| 2003 Volkswagen Bora VR6 | 2015 Volvo S60 Polestar | 2014 Tesla Model S |
| 2014 Rolls Royce Wraith | 2016 Rolls Royce Dawn | 2018 Renault Megane Renault Sport |
| 2017 Alpine A110 | 2018 Porsche Gunther Werks 400R | 1993 Porsche 928 GTS |
| 2004 Mercedes C32 AMG | 1988 Volkswagen Scirocco 16v | 2012 Infiniti G37 IPL |
| 2003 Volkswagen Bora VR62015 | Volvo S60 Polestar | 2014 Tesla Model S |
| 2014 Rolls Royce Wraith | 2016 Rolls Royce Dawn | 2018 Renault Megane Renault Sport |
| 2017 Alpine A110 | 2018 Porsche Gunther Werks 400R | 1993 Porsche 928 GTS |
| 2004 Mercedes C32 AMG | 2016 McLaren P1 GTR | 2010 Mazda Mazdaspeed 3 |
| 2018 Land Rover Velar | 2019 Lego Bugatti Chiron | 2018 Jaguar i-Pace |
| 2017 Dodge Demon (Fast 8 spec) | 1975 Citroen DS23 | 2012 Chrysler 300C |
| 2014 Chevrolet SS | 1990 Chevrolet Camaro IROC-Z | 2000 BMW Z8 |
| 1984 BMW 635CSi | 1996 BMW 850CSi | 2000 BMW 323i Sport |
| 2009 Aston Martin Vantage | DeTomaso Pantera 1971 | Citroen DS23 1975 |
| Citroen C4 VTS 2009 | Chevrolet Corvair 1969 | Chevrolet Cobalt SS 2010 |
| Bentley Turbo R 1992 | Austin Seven 1924 | Audi TT 2004 |
| Audi R8 LMS 2018 | Aston Vulcan AMR Pro 2019 | Aston Virage 2012 |
| Aston Vanquish 2001 | Aston DB7 Zagato 2003 | Alfa Brera Ti 2009 |
| Alfa Giulietta BTCC 2018 | Renault Clio 197 2007 | SSC Ultimate Aero 2010 |
| Volkswagen Golf WTCR 2018 | Volvo C30 Polestar 2013 | Shelby 1000 2012 |
| Renault Clio RS 2016 | Volvo C30 2009 | Dodge Magnum SRT8 2008 |
| Renault Megane R26R 2008 | Venturi Atlantique 1997 | Ford Mustang TA 2018 |
| Rover SD1 1984 | Triumph TR7 1979 | Ford Ultra4 Bronco 2017 |
| RUF CTR2 1995 | Triumph GT6 1973 | Ford Mustang 1991 |
| Saab 9-3 Turbo X 2008 | Subaru Crosstrek Desert Racer 2017 | Ford Mustang SCCA 1998 |
| Savage Rivale GTS 2013 | Subaru Levorg GT 2018 | Ford Escort MK2 1977 |
| Ford Escort MK1 1967 | Fiat Coupe 2000 | Ferrari Portofino 2018 |
| Ferrari 599 Formula Drift 2018 | Ferrari 488 Challenge 2017 | Dodge “Supercharger” 1968 |
| Dodge Stealth Turbo 1996 | Lotus Evora GT4 2018 | Lotus 35 Martin 1966 |
| Lincoln MKVIII 1998 | Lincoln Continental 1962 | Lamborghini Espada 400GT 1973 |
| Kurtis Kraft KK500C 1954 | Honda Civic Si 1999 | Hennessey Velociraptor 6×6 2018 |
| GMC Jimmy 1970 | Ford Thunderbird 1957 | Ford Supervan 3 1994 |
| Ford Racing Puma 1999 | Ford Mustang SVO 1986 | Ford Mustang GT390 1968 |
| Ford Lola T90 1966 | Ford Ka 2011 | Ford GT70 1970 |
| Ford Formula 4 2014 | Ford Focus SVT 2003 | Lotus Esprit Turbo 1980 |
| Land Rover Defender “Paypal” 1997 | Land Rover Range Rover SVR 2018 | Maserati Gran Turismo MC 2010 |
| Maserati Quattroporte 2012 | Matra-Simca MS650 1970 | Mazda 323GTR 1992 |
| Mazda ProMazda 2013 | Mazda USF2000 2013 | McLaren M6GT 1969 |
| McLaren Speedtail 2019 | Mercedes E55 AMG 2006 | Mercedes E63 AMG 2012 |
| Merecedes E63S AMG 2018 | Mercedes SLR Stirling Moss 2010 | Mitsubishi FTO 1998 |
| Mercury Cyclone Spoiler 1970 | Napier Railton 1933 | Nissan 370Z Formula Drift 2018 |
| Nissan Pulsar GTI-R 1990 | Nissan Dakar 2004 | Panoz Esperante 2005 |
| Peugeot 205 Rallye 1991 | Peugeot 206RC 2004 | Peugeot 207RC 2007 |
| Peugeot 207 Super 2000 2007 | Porsche Macan “RR” 2018 | Porsche 956 1983 |
| Porsche 911 Desert 1985 | Porsche 911 GT3R 2018 | Porsche 356C Emory 1964 |
| Porsche Singer 911 1990 | Porsche 911 Sport Classic 2010 | Porsche 911 997 GT3 2007 |
| Porsche Boxster S 2010 | Porsche GT4 Clubsport 2019 |
