some guys build streetrods and racecars, i build generators..go figure..yup trying to keep the noise down on this one,Sonny the first and second generation military units had White,Detroit,Continental and AllisChalm diesels,very noisy,no attention paid to silencing the noise at all..the 3rd generation military units had Yanmar and John Deeres in them with silencing and good mufflers and followed the same rad cooling airflow path I am, airflow thru the radiator,up and past the muffler then out the top..Im following the same design but with more adhesive asphalt pad mass loading of the panels and fireproof insulation for noise deadening..its only got 150hrs on it, basically new..the original housing was trashed so I decided to give it a new life..can't say I haven't done something with my Covid time off
