Rock Star has announced that the first expansion pack for GTA IV is now available exclusively on the Xbox 360. The expansion pack sells for 1600MS point or $19.99. Players can also buy download cards for the expansion at select retailers that can be redeemed on Xbox Live.

The expansion adds new narrative to the game that goes along side the original story line and introduces a new player character names Johnny Klebitz. Klebitz is the VP of The Lost motorcycle club. The story centers on the release of the club president from rehab and a feud with a rival gang.

The pack introduces new weapons, music, multiplayer modes and mini-games along with new vehicles and more. The full version of the original game is required for the expansion pack. This was one of the hottest games of the holiday season and the expansion is sure to sell well.

Via Rockstar