* 5.6L Endurance V8: This was the standard engine, producing 305 horsepower and 380 lb-ft of torque.
* 5.6L VK56DE V8: This was an optional engine, producing 305 horsepower and 385 lb-ft of torque.
It's important to note that the 5.6L VK56DE V8 was only available for certain trim levels and models in 2006.
To determine the specific engine size in a particular 2006 Nissan Titan, you'll need to check the vehicle identification number (VIN) or consult the owner's manual.
