This is a Finned Aluminum Differential Cover for Nissan R180 or R200 equipped vehicles.
The addition of these covers allow for cooling of your differential while driving, as well as the increase in overall oil capacity. The R180 cover increases capacity to 1.8L while the R200 cover is increased to 2.2L! Holes can also be drilled and tapped to install a differential cooler for serious racers!
Please note that the use of these diff covers requires the use of ESCORT's reinforced Diff Cross Member as the covers will not clear OEM members.