this looks nice, just wondering if anyone has it or if its a bit overkill
http://www.arcinter.co.jp/arc/products/oil/deff.html

 

It's overkill if your Z doesn't NEED it. Like any additional cooler mod, one should be monitoring their temps to see if a cooler is necessary. I spew a small amount of fluid out my diff. during track events, but I'm not sure it's from overheating my Nismo LSD. Redline says it's NOT boiling.