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Old 03-30-2023 | 07:55 AM
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Default Best Dry Muffler

Hi All, Is anyone able to advise the best muffler than can run dry.
My motor is currently running dry to the tips exhaust with eickert headers.
However, too much cam overlap means I cannot run wet exhausts, but also need to quieten it down for marinas.
Any advice on the best muffler that would help me keep quiet in the marinas. please?

I was looking at GIL Select Sound and CMI After Firing Sound Choice as a couple of options. Are there other options, and what's "best" in terms of combining noise reduction while also not hurting performance.
Thanks



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Old 03-30-2023 | 08:40 AM
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I have GGB in my Skater and It drops it a few DB, Never had anything to compare them to. Not sure if they are still making Marine Exhaust or just doing Snowmobile/ Side by Sides. Might be worth a call.
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Old 03-30-2023 | 08:58 AM
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I've already got the GGB slip in ones - never really noticed much difference running them dry - I think they need a bit of water to really start to work properly, which is the issue here.
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Old 03-30-2023 | 09:19 AM
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Found this excerp from Smitty (articfriends)

Originally Posted by articfriends
When i started using my dyno i had giant semi or tractor mufflers, i found they still cost 15 to 20 hp though, it may have been exhaust reversion though where 6" tube slipped over 5" tube. I had a set of 5" 400$ gibson clampons laying around and stuck them on the 5" pipes, they cost about 3 hp at 550 hp, cost 7 to 10 at 700 hp. After 100 pulls they still look fine and there is nothing in thembto burn out, might be a viable, cheap option for you! How much hp we talking?
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Old 03-30-2023 | 01:02 PM
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Damn that is a sweet looking motor
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Old 03-30-2023 | 02:03 PM
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Originally Posted by SB
Found this excerp from Smitty (articfriends)
I have two sest of Gibson Clamp on for sale if you want to try them. Great shape. 4" inlet, 4.5" outlet. Best offer and will ship for free.

Gibson Performance Exhaust 110003 - Gibson Bullet Stainless Superflow Marine Mufflers


Thanks.

Ed
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Old 03-30-2023 | 03:32 PM
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Any chance you're just going to burn the rubber hose out . Curious about the cam specs. Do you have deflectors in the stainless band to send the water to the rear.
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Old 03-30-2023 | 06:49 PM
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Have you considered down turns?

https://www.cpperformance.com/c-2201-down-turns.aspx
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Old 03-31-2023 | 07:27 AM
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I ran Gibson clamp ons, on my Eickert dry to tip set up on Innovation 600s. They didnt make the boat quiet, by any means, but did get rid of the very sharp crackle. No issues with burning, etc.. One of my favorite sounds EVER, was lighting them up, and the sound before the water even hit the tips! Neighbors and Wife, not so much
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Old 03-31-2023 | 07:51 AM
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I have the Gibson's as well and they take some of the bark out especially idling down the river. But when she gets in to the powerband it sounds awesome. I've run with and without and I can't tell the difference. I've noticed way more difference when I added a 4 hole tapered spacer under the carb. Their truck exhaust uses the same design and I have over 150k on my Gibson truck exhaust.
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