OS O.S. MAX 21XZ-R

In the pits, time is the enemy and O.S. 21XZ-R can defeat it. They can run a full 10-minute heat on just one tank of fuel, while most other engines require two. That puts you a pit stop ahead of the pack and in sole possession of the lead to the checkered flag. The 21XZ-R VII's aggressive timing puts explosive acceleration and top-end speed at your fingertips, while surprising starting ease lets you unleash its race-winning potential right out of the box.