Update: The reduction has been made in honour of Harold Ramis.
"Harold Ramis was a comedy genius," Tweeted Criterion. "He inspired us. To honour this legend, #BurnoutParadise #LegendaryCars are free today for #Xbox360."
Original report: Burnout Paradise's Legendary Cars Collection has been made available as a free download on Xbox Live - six years after the game first went on sale.
The Legendary Cars Collection previously cost £3.99 and features four vehicles based on famous movie cars, including the Jansen P12 88 Special, Hunter Cavalry Bootlegger, Hunter Manhattan Spirit and Carson GT Nighthawk.
To queue it up for download, head through to Xbox.com.
There doesn't appear to be any reason why the DLC has been discounted, although it still appears to cost full price on PSN.
In the years since Burnout Paradise, Criterion went on to develop Need For Speed: Hot Pursuit and Need For Speed: Most Wanted, but was significantly downsized last year. Its next project is believed to be a new IP for next-gen consoles.