Need for Speed Most Wanted's iconic BMW M3 GTR (E46) returns in the new Need for Speed (2015). Also featured in NFS Carbon, and the 2012 version of NFS Most Wanted.
The car and wrap are available for free (in-game money) if you purchased the deluxe edition ($10 extra). If you bought it and don't see it, make sure you've downloaded the deluxe edition content. Otherwise, the car and GTR body kit are available to purchase in-game through normal progression. The iconic wrap/livery doesn't seem to be available right away however. I'm speculating that you either have to complete the game first or find the collectibles or something along those lines.
This video features some gameplay events from Sprint, Circuit, and Drift races. Watch to the end for some glitches and funny moments. Car is almost fully upgraded. Just level restrictions keeping me from buying a few of the very final upgrades.