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Look at www.b-quiet.com. I used a combination of the brown bread and the L-comp in my F350 Powerstroke crew, it made a huge difference, like a mercedes now at highway speeds. $$$ though, think I spent about $600 plus 3 days to totally gut the interior to install. There will never be any question that its a diesel though, especially under acceleration. Just wanted to tone it down for the long highway trips which it did just fine.
 
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