BTTF DeLorean appears under the name of 'Science Fiction', flat hood. 1982+.

DeLorean made a official return to Forza since the FM4 Jeremy Clarkson narration drama, 1982 model, not much of a customization available sadly.

DeLorean appears under the name of 'Dalorean', 1982 flat hood, early batch of matte gray rims.

DeLorean is available via mod from steam workshop, made by one of original developers of the game. https://steamcommunity.com/sharedfiles/filedetails/?id=812009251

DeLorean is drivable, but because of game's low pixelated aesthetic, it's impossible to determine what model and option that car has.

User made mod available, ~82 model with side stripe livery, modeled from scratch. http://www.maniapark.com/ressource.php?id=2461

User made mod available, '81 model with BTTF2 setup. http://www.trackmania-carpark.com/car.php?id=89

Appears under the name of "De Loan' can only be painted, with pastel colors, flat hood. depicted as a front-engine car for some reason.

Appears in the name of 'Electric' can be fitted with BTTF-style mods and supercharger under the front trunk(?) '82 flat hood.

Drivable via MODS from the workshop, 'Official' LEGO version and other user made cars available.