aFe Street Series differential covers bring the power and performance with a dash of style. Constructed out of durable die-cast aluminum, these aFe Street covers are designed with reinforced ribs for maximum strength. Plus, they feature built-in fins that transfer heat from the fluid to the outside air for maximum cooling. The covers are fitted with Neodymium magnetic drain plugs that capture loose particles to provide maximum gear protection, plus 1/8 in. NPT calibration plugs that are set to the factory fluid level for easier/quicker filling and eliminate accidental overfilling. You can choose raw or black powdercoated finishes with machined ribs for style. aFe Street Series differential covers are engineered to be your only choice for best-in-class protection, performance, and value.