Rogue Engineering Differential Cover Features: 100% produced in the US (casting, machining, heat treating, silicone bath), new Rogue Engineering factory bushings included, Increases fluid capacity additional 1.5 quarts (total of 3 quarts), Oil temp sending port tapped (plug supplied), Grade 12.9 Zinc Plated Hardware and factory gasket included, Reinforcement bridge connecting the cooling fins for increased strength (like the E46 M3, E39 M5, and E60 M5 factory covers), Lowest point of the differential only 2.25 inches, Reinforce walls (compared to similar covers) for increased strength, Optional fittings are available, at additional cost, for adding an feed and return lines to a remotely located cooler.