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Thread: Exhaust louder?

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    Exhaust louder?

    Anyone else notice that your exhaust gets louder during days/nights with heavy moisture/fog in the air (not rain). Click here to enlarge

    I wonder if its because the wool in the stock mufflers absorbs the moisture and loses some of its sound absorption properties.

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    Never really noticed. Of coarse, it's been nearly 2 years since I've had then stock muffler.


    Sort of on topic but I've got something pretty freaking cool in the works for a unique exhaust setup Click here to enlarge
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    I bet it has more to do with the properties of humid air vs. dry air, or water vs. dry air, you could say. Sound attenuation given by Stokes' Law is about 2000 times less through water than air. Because humid air is a mixture of water and dry air, it is reasonable to conclude that humid air attenuates sound less than dry air. Maybe that is why your exhaust sounds louder when the air is humid.

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    Click here to enlarge Originally Posted by ajm8127 Click here to enlarge
    I bet it has more to do with the properties of humid air vs. dry air, or water vs. dry air, you could say. Sound attenuation given by Stokes' Law is about 2000 times less through water than air. Because humid air is a mixture of water and dry air, it is reasonable to conclude that humid air attenuates sound less than dry air. Maybe that is why your exhaust sounds louder when the air is humid.
    Similar to how you can hear some noises better unter water.

    I happen to live within a mile of a mojor highway. I never hear the road noise unless its really early in the morning and the air is still moist.

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