There's a handfull that have done it and a couple of ways to gitrdon.
any ol' cooler will do.
There are 2 ports on the front of the case and the bottom. M14-1.25 if I remember correctly.
Now the last time I went to the dealer I saw something that just made me drool, and I asked where do they park these at night?
It had I mean has a nice oil cooler on the front, oil lines running down about the right place too.
But what I'm intending to do as a phase 1 project, is to run some copper line up from one port to the other. And plug in a temperature gage.