At least one of these American classic cars (1950s-1970s), potentially from the following
- 1949 Mercury Coupe (Recycled from FH4)
- 1957 Ford Thunderbird (FM4 Returnee)
- 1959 Cadillac Eldorado Biarritz Convertible (Recycled from FH4)
- 1961 DeBerti Designs Ford Econoline (New to Forza)
- 1962 Lincoln Continental (New to Horizon)
- 1964 Ford Fairlane Thunderbolt (New to Horizon)
- 1966 Chevrolet Nova SS (Recycled from FH4)
- 1967 Chevrolet Chevelle SS 396 (Recycled from FH4)
- 1967 Dodge Coronet W026 (New to Horizon)
- 1968 Pontiac Firebird (Recycled from FH4)
- 1969 Chevrolet Corvair Monza (FM4 Returnee)
- 1969 Oldsmobile Cutlass 442 Hurst (Returnee from FH4)
- 1969 Pontiac GTO "The Judge" (Recycled from FH4)
- 1970 Mercury Cougar Eliminator (Recycled from FH4)
- 1971 Chevrolet Vega GT (Recycled from FH3)
- 1971 Plymouth GTX (Returnee from FM7)
- 1971 Plymouth Roadrunner GTX (New to Forza; personal speculation)
- 1978 Ford Mustang II King Cobra (Recycled from FH3)
At least one of these retro American cars (1980s-2000s), based on past leaks and recycled content
- 1986 Dodge Shelby Omni GLHS (New to Horizon)
- 1990 Chevrolet Camaro IROC-Z (Recycled from FH4)
- 1991 Ford Thunderbird SC (New to Forza; leaked iirc)
- 1990 Chevrolet Silverado 4X4 2500 (Spotted in FH5 audio recording; personal speculation)
- 1991 Chevrolet Silverado SS 454 (Personal speculation)
- 1995 Ford Mustang SVT Cobra R (Recycled from FH3)
- 1996 Dodge Stealth Turbo (New to Horizon)
- 2003 Ford Mustang Terminator (New to Forza)
- 2006 Dodge RAM SRT-10 (New to Horizon)
- 2007 Shelby GT500 (New to Horizon)
- 2008 Jeep Grand Cherokee SRT-8 (New to Horizon)
- 2005 Panoz Esperante GTLM (New to Horizon)
- 2005 Pontiac Aztek (New to Horizon)
- 2008 Pontiac G8 GXP (New to Horizon)
- 2008 Saleen S331 Supercab (New to Horizon)
- 2009 Pontiac Solstice GXP (New to Horizon)
And at least one of these modern American Cars (2010-present) based on past leaks and past content as well as some personal guesses assuming that the trend of adding at least 1 2019+ car is still persistent.
- 2010 Chevrolet Cobalt SS (New to Horizon)
- 2010 Dodge Viper SRT ACR-X (Recycled from FH1)
- 2012 Dodge Challenger SRT-8 392 (Recycled from FH2)
- 2012 Dodge Charger SRT-8 (Recycled from FM7)
- 2021 Dodge Charger SRT Hellcat Redeye (new to Forza; personal speculation)
- 2012 Cadillac Escalade ESV (Recycled from FH4)
- 2016 Cadillac Escalade ESV/Hennessey Variants (new to Forza; personal speculation)
- 2021 Cadillac Escalade ESV/Hennessey Variants (new to Forza; personal speculation)
- 2013 Dodge Dart GT (Recycled from FH3)
- 2011 Ford Shelby F150 SVT Raptor (Recycled from FM7)
- 2013 Ford Mustang Boss 302 (Recycled from FH1)
- 2015 Ford Mustang GT (Recycled from FM7)
- 2017 Jeep Quicksand Concept (New to Forza; I mean, it was added in The Crew 2, so why not add it in FH5 too?)
- 2018 Jeep Wrangler (New to Forza; Personal speculation)
- 2021 Jeep Grand Cherokee (New to Forza; Personal speculation)
- 2010 Saleen S5S Raptor (Recycled from FH4)
- 2017 Saleen S7LM (Leaked, new to Forza)
- 2019 Saleen S302 Black Label (new to Forza; personal speculation)
- 2018 RAM Rebel TRX (Recycled from FH4)
- 2020 Chevrolet Camaro SS (facelifted; new to Forza; personal speculation)
- 2023 Chevrolet Corvette Z06 (New to Horizon)
- 2021 Dodge Durango SRT 392 (New to Forza; personal speculation)
- 2022 Dodge Charger SRT Hellcat Redeye (New to Forza; personal speculation)
- 2023 Dodge Challenger SRT Demon 170 (New to Forza; personal speculation)
- 2023 Ford F-150 Raptor R (New to Forza; personal speculation)
- 2024 Ford Mustang GT/Dark Horse (New to Forza; personal speculation)