The Need for Speed Website has details on two new content packs for Need for Speed Undercover, which are both now available on the PlayStation Network, and are coming soon for Windows and Xbox 360. One is a free Challenge Series pack that adds 60 events across two gameplay modes, and the other a premium Boss Car pack that gives access to the entire fleet of boss cars in Undercover for 400 MS points, or $5.00 in money. Here's word on the Challenge Series:

    • Highway Wars is the ultimate fusion of Undercover’s signature Highway Battles with the adrenaline fueled competition of sprint racing. In this mode, players will race at top speeds through traffic filled highways against three AI opponents in a winner take all battle to the finish line.

Highway Checkpoint forces the player to push their car to the limit as they weave through traffic in an attempt to make it to the next checkpoint before time expires.

    • Players can also earn three new vehicles as they complete the Challenge Series. Each vehicle is available for use in career or online and has been specifically tuned to compete against the top cars in the game.
        • Battle Machine Mazda RX-7 will be awarded upon completion of the first 30 events.
        • Speed Machine Porsche 911 GT2 with matte black paint and custom gold liveries will be awarded after completing all 60 of the Challenge Series events.
        • Dominator Corvette Z06 is for players that dominate a minimum of 31 events.