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Outside the bay makes what you are going for a little tougher but I have seen these and they do cut the noise from what I call average. Not sure if this design is what you want for externals. Probably more of an arch is what you are looking for. A lot of the tunnel designers have silencing packages too can put on them. You would need a decibel reading to confirm whatever you buy as being “quieter”. There are a lot of external factors that play into the sound too. If you have a lot of concrete and storefronts across the street from your exit and next to you, they can act as echo chambers and bounce the sound around - keeping it live. Now if you are across the street from an open field, that will help your cause.
internationaldrying.com
