!!! Be sure to avoid thrust area behind Hybrid M/C Rider cone during bean propellent testing ! Very dangerous area !! mukle I would suggest wrapping baffle core loosely with fiberglass muffler packing or SS Wool packing, because the tighter you wrap and pack it in there the higher the exhaust pitch will be. If you have maybe 6-10 5" discs in there should be like 0 restriction and good sound, you can adjust it with # of discs to you get an acceptable sound. Is that a perforated or louvered baffle ?