This is the baffle I knocked up prior to riding to the FOIM. I realised I was later than I expected at that point, so it was quick. Not pretty, but very effective as it happens. Many years ago Mark Harris who was Madaz at that time told me a baffle needs to fully obstruct the linear flow of the gas to really work, but without that obstruction being overly restrictive as such. The previous one was a shorter tube much the same size with an open end, like a Staintune baffle would be. It really didn't make that much difference.
Not sure how this will work on the dyno. Not sure that I want or care to find out.