Hi Guys- I just joined the site since I recently bought an 04 tahoe z71 and absolutely love it . I want to increase mpg primarily and performance also. I heard installing a cold air intake and getting a hypertechh max programmer was an easy way to do this. However after talking to several mechanics concerning a cold air intake, they did'nt recommend it. The reason being because of the greater surface area allowing more air flow, it also allows much more dirt and other small particles to enter the engine as can be seen if you take off the intake and look in the manifold after some use. Which in turn damages the engine. It makes sense in theory but is this actually true. I find it hard to believe that K&N and other companies out there don't make the filter of good enough quality/materials to prevent all this junk from entering the engine?? Could you guys provide some feedback. Thansk for your help and i look forward to learning alot and giving feedback when i can also from this site !