Question about GGB Mufflers
 

I bought two pair of the GGB clamp on mufflers over the winter for my dry setup and have not used them yet. Was just reading the on line ad below and it says that they can be converted for use on a DRY system.

I have a dry system and this is the reason I purchased the GGB's. But there is nothing in the directions about converting them. Does anyone know what they mean, or know what needs to be done to run these on a dry system?


GGB Extreme 4.5" Clamp-On
Avoid that unwanted stop on the water this summer with the Extreme! The Clamp-on is for use on 4.5" wet exhaust systems but can be converted for use on a dry system. Installed mufflers extend past the transom 8.5". Zero performance loss with noise reductions of 12-15dB. Water reversion flap is standard. Mirror polished from 316L SS.

Re: Question about GGB Mufflers
 

I run them on dry CMI headers. Graham from GGB told me to simply remove the rubber flapper in the mufflers to run them on dry pipes. I have used them for just about the whole season without a problem.

Re: Question about GGB Mufflers
 

How do these mufflers sound?I would like to install on a wet system but I dont want it to quit.I want a nice rumble.
Thanks
Nordic95

Re: Question about GGB Mufflers
 

All the ones that I heard with wet exhaust, are real, real quiet. :(

Re: Question about GGB Mufflers
 

Thanks :drink:

Re: Question about GGB Mufflers
 

I have them, the transom mount not clamp on, and they do knock about 12-15db off the sound. Before my 525efi was so loud that even at idle speed it was hard to talk to my woman sitting across from me. Now we can carry on a conversation and I still have a very nice rumble. When you throttle up they come alive and there is no doubt you have a health power plant. I'm happy with them and would not change back to open exhaust.

Re: Question about GGB Mufflers
 

I'm running stainless marine 3's with 5" tails with ggb's on a blower motor (wet). It was obnoxiously loud open,it still screams with the ggb's but it is tolerable,not exactly real,real quiet,Smitty

Re: Question about GGB Mufflers
 

I run them on my Gun with 800s and Stainless Marine Wet, they are great, you can talk at cruise speeds and the engines sound very mild at idle.
Before these GGBs you couldn't even talk at idle,it was a scream fest.
We will be installing the 5" on our wet 1050s in our Cat in a month or so and expect the same results.
They work well for us!

Re: Question about GGB Mufflers
 

I have some 4.5" clamp on's on 700 sc's . great sound almost too quiet tho. i took out the flappers. much better. great product.

Re: Question about GGB Mufflers
 

Putting 4.5" on my semi-dry tailpipes for spring. Lofty suggested removing the internal flappers if I wanted to hear anything at idle. I will be running external flappers.

Re: Question about GGB Mufflers
 

The biggest complaint on the GGB's is that they are too quiet at idle. Pulling the flappers out will fix this problem without making them too loud.

If you are running them dry you must remove the flappers. If you don't they will remove themselves in about a 1/4 mile! Dry systems are loud, period. If you add just a little water into the pipe just before the muffler you will get a huge reduction in dB's.

Re: Question about GGB Mufflers
 

If you are looking at GGB's checkout:
http://www.offshoreonly.com/classifi...1&cat=5&page=2

Re: Question about GGB Mufflers
 

My boat with Keith Eickert manifolds and GGB transom mount mufflers registers 94 db at idle...

I had to install "down tubes" to meet the 86 db Wisconsin law
so now it blows bubbles in the water when at rest at 82db...But still sounds AWESOME once up on plane... :evilb:

Doug

Re: Question about GGB Mufflers
 

Doug,
I will have to perform a decibel test for comparision. I am also running KE's and transom mount GGB's with a single 540.
Are you running the Extreme Series?
94 db at idle seems high.
Russ

Re: Question about GGB Mufflers
 

Yes, I am running the Extreme series transom mount mufflers.

I am also running a water circulating pump...It seems that guys running crossovers have a bit more water flow which makes the exhaust quieter yet....


Doug

Re: Question about GGB Mufflers
 

Boatally Insane,
I too will be trying to comply with the 86db in Wisconsin. Could you send me a picture of your "down tubes". Not sure how I'm going to quiet mine down..Please send a picture to [email protected]
Thanks.
Steve

Re: Question about GGB Mufflers
 

Will the GGB clamp ons fit this application. The dry headers and tails are Stellings. The water dumps at the end of the tail via one tube. Will the water drain and blow through the muffler without problem with water reverting?

Re: Question about GGB Mufflers
 

We've put them on lots of Stellings. The water will blow through the muffler but I can't tell you that you won't have reversion. You shouldn't but it will depend entirely on your motor set up.

Re: Question about GGB Mufflers
 

How does your water exit the tail pipes? I have stellings dry pipes, and there is a tube on the outside of the tail pipes that dumps the water. Exhaust and water never mix. I have seen stellings that dump inside the tailpipes just at the very end.

I run the ggb clamp on extremes. I drilled holes around the inside of my tail pipes to let water enter at the mufflers. You can also cut a hole in the bottle of the ggb's to let the water exit below if you want totally dry pipes.

They work very well.

Re: Question about GGB Mufflers
 

My Stellings dump inside through 1 tube at the very end.

Re: Question about GGB Mufflers
 

You can weld the inside dump shut and drill an external one. I wouldn't unless I wanted louder exhaust. This far back in the exhaust I wouldn't worry about reversion. I've never had an issue. You should kill 15-20 dbs with water running in the mufflers. And they will not discolor.

Re: Question about GGB Mufflers
 

I installed them Saturday and ran the boat on the hose.

It was much quieter then I expected, but still sounded good. Kind of took the edge off.

I did remove the rubber flappers. I bet it is very quiet with them on.

Re: Question about GGB Mufflers
 

Does your water dump inside or outside the tailpipes?

Re: Question about GGB Mufflers
 

My CMI tailpipes dumped the water right at the end of the pipe. Now it mixes inside the mufflers.

Re: Question about GGB Mufflers
 

OK, thats why there so quite. The water cuts 5-10 more dbs off. I dropped over 20dbs with water in the mufflers. I'll bet your well under 90db now.

Re: Question about GGB Mufflers
 

The water realy helps quite them down. We've tried running GGB's on Stellings both wet and dry and they are amazingly quite with just a little water entering and no flappers.

Re: Question about GGB Mufflers
 

I'm thinking about getting these mufflers, how do they work? Will they work on naturally aspirated 700hp motors?

Re: Question about GGB Mufflers
 

They work great. The only time I've seen a problem was on 1500HP Blower motors.

Re: Question about GGB Mufflers
 

zt260, what was the deal on those blower motors? I heard about that problem and it got us worried becuase we put a few on 1500hp mills too. We never saw a problem and believe me, with those mills I was concerned!

The 700hp n/a motors will work just fine. We've noticed the low end picks up a bit on the bigger hp n/a motors and GGB's.

Re: Question about GGB Mufflers
 

Lofty,

Can you elaborate on this? I have 510 c.i. 645 h.p. Sterlings. Are you suggesting I will see improvement in low-end torque with the GGB's installed?

Thanks,

Chris

Re: Question about GGB Mufflers
 

Chris,
The GGB's create back pressure at low rpm's IF the rubber flaps are left in place. This back pressure seems to help the low end on most N/A motors.

Fionn