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Did anyone read the OP?? He said "very quiet". Maybe he should have given a decibel reading he wanted to stay under, cause none of the muffs listed fall in the very quiet catagory IMO. Straight throughs of any kind shouldn't even be a consideration - unless they are mounted on a sewing machine .

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That is why I said Turbo..

FWIW I run the Aero chamber mufflers and have been 135mph through them. Not real quiet but they do cut down on the noise quite a bit. I am not sure if they come in 4"