* 3.3L V6: This was the base engine, producing 180 horsepower and 200 lb-ft of torque.
* 4.0L V6: This was the optional engine, producing 265 horsepower and 284 lb-ft of torque.
It's important to note that the specific engine in a 2004 Xterra will depend on the trim level and the specific vehicle. If you need to know the engine size of a particular Xterra, you can check the vehicle's identification number (VIN) or consult the vehicle's owner's manual.
