Banks Ram-Air Differential Cover is the best one on the market without question. Thanks to its superior fluid flow and aerodynamics, the Ram-Air Cover out-cools stock and flat-back high-capacity covers and does so with less lubricant. Extend your gear life, use less fluid, and save money between fluid changes with Banks. Note: 2019-24 RAM6.4L Gas Trucks Customers must visually confirm which differential cover is installed from factory. When it comes to product development, we only make products that increase performance and beat the competition. So when we tested the popular Diff Covers on the market, we were shocked to find out that they actually hurt performance. This lead to the development of something so New and Incredible that our performance design has a United States Patent. Look, when we set out to build a product for your vehicle, we only engineer the best. What else would you expect from a company with a winning legacy that spans decades. We are here to win, and we just did (AGAIN) in a huge way