For those who are interested in installing the oil filter on your Carbon Cub, I hope this commentary and a few pictures will help.
The first thing I would do would be to go to Lowe's or Home Depot and buy approximately two feet of plastic hose to place on the outlet of the oil cooler after you remove the return line. You can secure it like a stand pipe or let it run into a container. I didn't and it will drip. With the hose and some rags, it will help you make the installation a little more sanitary. Also, I would suggest that after the return line is removed that you disconnect the breather line from the accessory case. It facilitates the installation of the 45 degree fitting and the filter adapter. The directions that are included with the STC are straight forward.
If you will note on the photo of the finished installation, be sure that the oil return line clears the filter can, and also note that I double zip tied two spark plug leads and an EGT line to the breather tube to keep it from rubbing on the filter can.
002.jpg leftside before starting
003.jpg parts in STC, be sure there is the 45 degree fitting
006.jpg filter base installed, breathe line disconnected
008.jpg breather and return line installed, brass plug and parts underneath on left rear of accessory case is ECI's replacement for a vernatherm
010.jpg completed installation