You misunderstood, the noise I'm talking about is the same one you're talking about coming from the front area like a fan real quick, this to my understanding is a feature of this engine and somehow that sound is something that is causing the cat's to warm up in under 1 minute due to the technology in this engine. I have attached a link of this information for your review. http://www.whnet.com/4x4/new_V6.html