Today on our 2018 GMC Sierra 1500 we're going to be taking a look at and showing you how to install the AirAid SynthaMax direct fit replacement premium air filter. You can see the AirAid one is actually made from two synthetic polyurethane layers, which is not only going to flow better, it's going to catch more debris. What's great about the AirAid is it's going to last longer than the paper… see more >