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Thread: Quieting a loud exhaust

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  1. #1
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    Quieting a loud exhaust

    Any cost efficient ideas on quieting down the exhaust on our Gibson?

    We've got four dry exhausts (with baffles I think) and the boat can get a bit loud out the back.
    Last edited by DitchRider; 08-26-2012 at 06:05 PM.

  2. #2
    Super Moderator OLD HOUSEBOATER's Avatar
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    Mufflers - not cheap
    The fries are cold so we gave you extra.

  3. #3
    Senior Member Dan's Avatar
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    Not cheap and not overly effective if you're talking about in line dry mufflers. My dock neighbor put them on his Harbor Master earlier this year and I really see almost no difference.
    1986 Gibson 50'
    Twin 454 Crusaders
    Monroe Reservoir, Bloomington, IN

  4. #4
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    Similar to these were on my Crusader 350/270s when I bought the boat. They work pretty well. I can carry on a conversation on the flybridge while under way, but not too fast. ebay for ~$75ea.


    SALISBURY TM-160 MUFFLER MUFFLE GARD SILENCER FOR FLANGE UP TO 5*1/2 DIAM

  5. #5
    Senior Member BananaTom's Avatar
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    I installed 90 degree rubber exhaust pipes off the rear discharge.

    That way it was not just the straight baffles, and turned the noise downward to the water.

    This did work some, for little money.

    But hey, enjoy the sound of two Chevy Cameros with open headers!!

  6. #6
    Senior Member Endurance's Avatar
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    The best person I can think of for fiberglass mufflers would be Wayne at Ultra Marine:

    Ultra Marine Products Inc
    5714 US Highway 411 S
    Maryville, TN 37801-1050
    Phone: (865) 856-9662

    The muffler he built for my ski boat (a MasterCraft with a 5.7L motor) is nicely quiet even though my exhaust exits the boat above waterline.

  7. #7
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    Where did you get your rubbers???

    Quote Originally Posted by BananaTom View Post
    I installed 90 degree rubber exhaust pipes off the rear discharge.

    That way it was not just the straight baffles, and turned the noise downward to the water.

    This did work some, for little money.

    But hey, enjoy the sound of two Chevy Cameros with open headers!!

  8. #8
    Senior Member 42gibson's Avatar
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    norwich,ohio
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    i found them on ....intakehoses.com

  9. #9
    Senior Member BananaTom's Avatar
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    Quote Originally Posted by DitchRider View Post
    Where did you get your rubbers???


    West marine.


    http://www.westmarine.com/webapp/wcs...classNum=50372
    Last edited by BananaTom; 09-01-2012 at 01:23 PM.

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