Easily the most aggressive differential oil upgrade available for your FD or RX8, the billet race diff cover offers a 300% increase in oil capacity, multiple ports for pumps, coolers, and temperature sensors, and even includes a vent port unlike most competitors, to eliminate crank case pressure build up concerns. 
Fully machined from a single billet block, there is no competition when looking for a case stiffening, diff saving solution. 


The new "DRAG" configuration also includes bracing features for your bearing caps. 


Pump ports are -6AN

The temperature port is an 1/8" NPT

Drain is an M14, with magnetic drain plug included

Fits OEM applications, no modifications are necessary. 


Please check the lead time page for current lead times.