Open Air 4" Intake Tube W/S&B Filter (2011-2016 6.6L Duramax LML)We have tested sealed box intakes vs open air intakes, and have found that overall vehicles do best without a sealed box around the intake. So we came out with our own 4 Open Air intake kit. These kits use American made parts, w stainless steel tubing & high quality 7 layer filters from S&B. Let your truck breathe better than the factory intake, while keeping even more dirt out. Our kits come in a raw finish. The raw finish gives you the option to