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Parked around Japan are Aftermarket Cars, which you can test drive or add to your collection. Some of these can be found near the Horizon Festival, while others require you to drive through the many regions of Japan with a sharp eye. Aftermarket Cars that match a Festival Race's campaign restriction can often be found to purchase nearby, so keep an eye on the map for the icon when approaching a race. Others will be located near Time Attack Circuits, fitted with modifications ideal for a track day.
These cars are typically offered at a discount, and they include some extremely rare and unique models to show off in your garage. For car collectors, they'll be a must-have. Some of the Aftermarket Cars you might encounter on your travels include the 2003 Honda S2000 featuring a Rocket Bunny body kit, the 1993 Autozam AZ-1 upgraded with Mazdaspeed parts, and the 2015 McLaren 570S Coupe equipped with Duke Dynamics modifications.

In Forza Horizon 6, "Aftermarket Cars" refers to a new gameplay mechanic where players can discover pre-modified vehicles parked in driveways and around the game world. Unlike standard "Barn Finds," these cars come with unique aftermarket tuning and custom builds that can be obtained directly from the environment.
Official trailers and leaks have confirmed several high-profile aftermarket brands providing body kits and parts for customization:

The game includes a dedicated Time Attack Car Pack featuring heavily modified, racing-spec versions of popular production cars:
Aftermarket builds in FH6 are supported by expanded customization options:
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