I recently installed a Cortex catch can for the rear axle when I installed the Watts link with their cover. I figured I was now covered for any diff fluid leakage until I ran Watkins Glen last week. I typically do 20 min sessions but this event had 45 min sessions and I had fluid all over the axle area after each run. It appeared to come out the small breather filter at the top. There was only a small volume in the actual canister which seems to make the unit useless if it doesn't actually keep the fluid contained. So I am thinking about a diff cooler. I saw the FTB and Kohr kits. Any other options that come ready to install? Where does the fan and cooler mount on the car? I wasn't expecting to need a cooler and shorter runs will likely not require it but I also don't want to have to keep cleaning up fluid.