Required reading:

https://improvedtouring.com...ad.php?t=26985

Just for the record, I'm in the "no more coolers" camp.

As for running a disconnected diff cooler in IT - show me the ITCS paragraph that says you can mount a non-functional diff cooler. IMO, this would clearly fall under IIDSYCTYC. For that matter, the cooler could also be considered illegal ballast... unless of course, you mount it in the passenger footwell.