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Old 01-19-2008, 07:04 AM
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i searched their website the marine part does not work...
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Old 01-19-2008, 07:10 AM
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I just put racing numbers on the bow and tell them i am testing propellers........They usually want to just see the boat....
What a great idea! I will try that.
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Old 01-19-2008, 07:23 AM
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I converted a dry tailpipe system to wet by drilling a two 3/16th holes at the tip of the inner pipe on the tail to allow water to flow into the muffler to kill the noise and keep my CMI mufflers from turning to crude. I was at less then 90 db with twin 1000 hp engines at idle. Other mufflers I tested were as high as 105db. The boat was 110 db with dry open exhaust. It would scare poeple when I started it if they were not aware.

The best setup is get the exhaust to exit under water at idle. I am 80 db with my twin 1400 hp cat at idle with CMI downturns.
You drilled the holes just before the mufflers? Which CMI's were they?

The problem I'm watching in Michigan is similar to the problem in Wisconsin, but with an added potential problem. They are looking to change to match Wisconsin law, (with the drive-by test), but tring to get the "Noise Gun" approved for use instead of having to do the drive-by.

If this is approved, they can ticket you from hundreds of feet away for exceeding the maximum db.

I am looking at the new Merc system they developed for Europe, looked closely at SaxMan's pics on his BT, and thinking maybe an in-line muffler, before a turndown underwater, may be the final solution.
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Old 01-19-2008, 08:45 PM
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Originally Posted by nocigarette View Post
i searched their website the marine part does not work...

For what it's worth...

I e-mailed them last week and got this response...

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Doug Schiller wrote:
From: Doug Schiller <[email protected] >

Do you still offer your \"extreme\" marine mufflers???

Thanks,
Doug


Hi Doug,

No we don't. In the near future we hope to offfer it again.

Graham

GGB Exhaust Technologies
P 705-384-2800
F 705-384-2741
www.ggb.ca



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Old 01-19-2008, 09:01 PM
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Here's what I was running when I lived in Wisconsin to pass the "idle" test.... 86 db at idle...










Doug

Last edited by Boatally Insane; 01-19-2008 at 09:11 PM.
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Old 01-20-2008, 09:00 AM
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Here's what I was running when I lived in Wisconsin to pass the "idle" test.... 86 db at idle...
Doug
That's a muffler and downturn?
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Old 01-20-2008, 12:53 PM
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That's a muffler and downturn?
Yep, GGB custom made them for me.


Gibson has something similar on the market but I see their site it down right now though......


Now that I've moved to Texas I don't need the turndowns to pass the noise law but I may leave them on anyway since they REALLY quieted down the exhaust noise in the cockpit, even while underway....

I might cut them a bit shorter though to gain some "dock presence"..


Doug
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