I've been curious what progress your making,, I took mine out a few weeks ago and had trouble again with my Brison, so I picked up a DLE,, Now I see why the guy cut so much fiberglass away,, it was to get the cowl over the muffler,, he still took way more off than needed,, but if it had a wrap around pitts muffler,, the cut out could be much smaller. I might order one and cut install the new cowl I have

Sorry for the crappy cell phone pic,, can't find my camera,,