I am about to buy a 2005 Nissan Titan XE with 168,195 miles. Its exactly what Im looking for and the price is right. But when I test drove it I noticed a ticking sound on the driver side under the hood. I stopped, popped the hood and revved the engine, but I cant hear it when its in park. It only happens when your driving it and putting some torque on the engine. I really dont believe its and engine or tranny sound. But, if it was an exhaust leak, wouldnt you be able to hear it all the time and not just when your in drive?