Well, I ordered and installed the XCal2 and the Airaid intake for my 05 Supercrew and have driven it for about 6 months now. I can say that I love the XCal2 and the programming from Troyer , but I absolutely hate the Airaid intake . The sucking or droning sound is great, but the vibration it creates while hitting the gas on the highway is just ridiculous. It is not too bad when driving around town, but my highway trips have become miserable. I will be taking it off tomorrow. I feel I have given it a fair amount of time to try and get used to it, but I hate it. I for one can't believe they even manufacture and sell a product like this. I also feel vendors should make their customers aware of the potential vibration before they make the sell. I know it is the customers responsibility to research the product, but I also feel reputable vendors should inform their customers of possible issues. Hopefully people on the fence will do their research and read this post and use it in their decision making when purchasing the Airaid Intake.