It's hard to believe that a high flow air filter could be a restriction. Well, if you use your truck for competition use, it certainly can be one. The S&B Turbo Screen Guard with Velocity Stack increases airflow by 18% and provides a restriction free path for air to flow. Constructed from premium silicone rubber that won't crack, has exceptional tear strength, and can handle temperatures as high as 400F. The embossed stainless-steel mesh is double stepped for added strength and allows clearance for all turbochargers and superchargers and the stainless steel black oxide clamp will ensure a secure connection. Designed for off-road use only. Not recommended for daily driven vehicles. Some colors are not available in every size.