I've got the acoustic control installed. The first impression is a 12 db drop on the highway. The road noise and wind noise are greatly reduced. The engine noise is still leaking through a few places. I'm looking into fixes for them. Overall I am pleased with results. We no longer need to yell while on the highway.
I tried to post pics, but it didn't take. If I can get the pics up, I will explain what we did.
Doc Weaver
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Doc Weaver '98 Freightliner FL60 pseudo toy hauler
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