* 4.0L V6: This was the standard engine, producing 265 horsepower and 284 lb-ft of torque.
* 3.3L V6: This was an optional engine, producing 180 horsepower and 198 lb-ft of torque.
It's important to note that the 3.3L V6 was only available for a limited time, and most 2006 Xterras will likely have the 4.0L V6.