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Mr. Metak--- What you are saying re all that Res. frequency makes some sense, but I am just a plain old civil engineer-- anything more that roads, buildings, good water, and bad crap is beyond me....... but are you saying we just need to cut a hole [or two?] in the exhaust pipe and weld one or two 27 in. closed end pipes into them, and find the space to fit them............ and the drone will be reduced/gone ??
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