UK developer Criterion has made the Burnout Paradise Legendary Car Collection DLC free today for Xbox 360 to "honour" Harold Ramis, who died recently.
Ramis famously played Egon Spengler in the Ghostbusters films. The Legendary Car Collection includes a reworking of the Hunter Manhattan Spirit, which the DLC made to look like the Ecto 1.
The Legendary Car Collection also includes the Jansen 88 Special, Hunter Cavalry Bootlegger and the Carson GT Nighthawk. You can grab it from the Xbox Marketplace.