Recommended For Road Racing. Recommended For Extended High Speed/High Temp. Reduces Gear Oil Break Down. Cooling Fins Help Reduce Gear Oil Temp. Cover Machined For Diff. Cooler Pick Up And Return Fittings. Pipe Plugs Installed. Incl. 10 Hex-Head Bolts w/Anaerobic Yellow Thread Lock Compound. Inc. 7-16-20 UNF Vent Plug For Appl w/Alternative Vent Provisions. Cover Machined For Temp Sensor w/M10 x 1.6-6H Threads. Made in the USA.