mufflers
 

Does anyone know who makes mufflers for dry exhaust?

None that I can think of. Any bolt on stainless steel muffler will discolor very quickly if dry. Any reason you need to stay with dry exhaust? If you convert it to wet you will be less noisy and can run mufflers.

GGB's, we have some in stock. What do you need?

I run GGB extremes full dry. They work great but look like $hit in a hurry. Might be the salt burning into them, but might be the stainless discoloring from heat. In either case, they come clean with some polishing.

Yep, mine get ugly too but that isn't a function of the muffler. Ever try CLR? Works great on mufflers or any stainless tail pipes. Spray it on, leave it for a few minutes them wash it down with soapy water. Cleans all that crud off.

Have you ever been tested for decibels?

I did a search on Speedwake website, thier was a thread that somebody had GGB on a dry exhaust and tested 94 db at idle. 90 db passes most states. Every three DB is about twice as loud. So they won't pass.

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.

I had no idea they even made a dry muffler..........I bet they are pricey..........I just put racing numbers on the bow and tell them i am testing propellers........They usually want to just see the boat....

No I have not. The mufflers take the bark out of it, but its still a bit loud.

I have GGB's with Keith Eickert's on a 509 and it tested at 94 db at idle WET........ :cool:


Doug

i searched their website the marine part does not work...

What a great idea! I will try that.

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.

For what it's worth...

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

Here's what I was running when I lived in Wisconsin to pass the "idle" test.... 86 db at idle...:D

http://i130.photobucket.com/albums/p...e/P1020879.jpg



http://i130.photobucket.com/albums/p...e/P1020877.jpg




Doug

That's a muffler and downturn?

Yep, GGB custom made them for me. :cool-smiley-011:


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"..:evilb:


Doug