I was able to get a 3"id coupler then a 3" 90* pipe then the 3" filter on with a lot of stretching and grease. its worked for me. Here is my tutorial edit:
But im not gunna lie, it was a bitch to get on. i ended up puting the couple around a metal bottle, then putting various screwdrivers and Allen wrenches in between the coupler and the metal bottle to stretch it then grease. i almost gave up it worked out!