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Smitty, Just a thought for your turn downs,I've considered an adjustable plate/perforated grate that slides over matching slots/holes in the elbow.
The design would serve back pressure as the tips are under water (addressing reversion) and subject to perforation/louver design, influence exhaust tone. Show us pictures or at least,keep us posted. |
Originally Posted by boatnt
(Post 2374359)
Getting the pontoon ready Bob?
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Originally Posted by WildWarrior
(Post 2374404)
I modified a set of stainless 5" HPI's by cutting 90 degree stainless tubing and welding to HPI out lets.
They are very quiet even at speed all you here is blower wine. They did however bring our EGTs on our 1300hp engines up to an unacceptable temperature level at high rpm. I believe the HPI's would work well up to 1000hp or or so as they are similar to my GGBs and they worked real well on my Gun with 850HP mills with no noticeable power loss and acceptable EGT's.. Good Luck, I'm still searching for something that will work on my set up, I would be happy with 100dbs at idle. Me too, IL. law is 90 and the dB police sound like their perking up this year. |
Anyone tried Zoomers? They had a great review in a 2004 Hot Boat issue.
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GGB's latest location.
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Originally Posted by GPM
(Post 2376626)
GGB's latest location.
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Hey Rbeyer, I just bought and installed a set of short barrel through transom Zoomers on my boat. The hot boat article on mufflers was March 2005. Zoomers supposedly helped top speed when installed on a boat. I feel that isn't very probable, but I hope the loss is minimal. They look good to me, all 304 stainless construction, I saw a thread on hot boat where someone was complaining of corrosion issues after one season of freshwater use. Hope its not true, I will see this coming summer.
I decided to give them a try after reading the hot boat article. I got a great deal on them from Trick Marine- 275.00 shipped to my door. Really. (I know I probably just ruined this thread.) Anyway I will let you know what I think of them when I can first test them. |
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Rob -
The CMI Sound Elimination Mufflers work great honestly. Muffled at idle and open while running yet take the bark out of the exhaust. Zastrow ran them right around 900 HP and passed with Lake County. Let me know what size and if you want clamp on or transom mount and I'll get you pricing. Email me at [email protected] Merry Xmas, Kirk |
Originally Posted by Vinny P
(Post 2374236)
I run GGB Extremes on my 725 HP, NA 540. They work great, however, as far as I know they are no longer in business.:(
I'm happy to say we do sell GGB. The Extremes are no longer available only an insert. It's too bad, the Extremes where a great product for most applications. I think they ran into some QC issues with a few and then dropped the design. |
zoomers
Originally Posted by RBeyer
(Post 2375211)
Anyone tried Zoomers? They had a great review in a 2004 Hot Boat issue.
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