FH3 FAQ: Cars
I saw a car but it’s not in the Autoshow.
The Autoshow does not show all car models in the game; some are obtained through gameplay. or the Auction House:
Barn Finds are hidden on the map
Skill Shop cars are unlocked with Skill Shop points
Midnight Battle cars are won after completing head-to-head street races
Horizon Edition variants appear in Wheelspins
Exclusive bonus cars added via content updates are only available as gifts/awards from Turn 10 (Forzathon and ForzaRC or other contests)