When removing an oil filter on the dyno you can make a mess. Our solution was to cut the side out of a 1 qt oil container. This catches any of the runoff and you can place the filter in the container to move it out of the way without any mess. I started using a 1-gallon jug for sprint car engines with oil filters mounted to the dry sump pump because they tend to make a significant mess when they are removed. Just happened to be what we had handy that would do the job.