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If you drill the down tubes from the cannister of the pitts muffler from all directions so it looks like cheese or mesh leaving at least 1/2 inch not drilled then put a piece of aluminum pipe at least one inch bigger over it welded to the can cut a piece of 1/8 aluminum flat stock so it just snuggly fits inside the now larger down tube and tight to the original down tube pack it full of muffler packing you can get from any motorcycle shop and screw the 1/8 inch caps from the outside of the outer down tube into the cap you will be amazed at the noise level decrease and zero power loss. Try taking the spark arrester of a two stroke dirt bike and see how loud it is essentially they are just a glasspack as known in the muffler world hope you guys understand ? I drew a quick sketch that I attached I know these work awsome as I roadraced two stroke Honda Motorcycles for years and also wrenched on them I don't know why these r/c airplane exhaust companies don't make them like this I guess they know nothing about muffling just how to divert the exhaust out of the cowl There's my 2 cents worth OH! by the way how do you think silencers for guns are made ? LOOK FAMILIAR????I was making a set in my third year sheet metal apprenticeship class and my teacher took them away thought I was making silencers till I brought the motor and rest of the pitts muffler to prove I wasn't!!
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