Is anyone running the gibson or something similar to the exaust turn down pipes, that dump the exaust under the water at idle. how well do they work. I,ve got e-tops that come out of the engine hatch and it is loud. I need to get to 88db at idle. will they work?

I have 1000 HP with Etops and added the CMi down turns. I am at 78 Dba at idle. Unfortunatley sounds like a Bayliner, but keeps the water patrol off my case.

Do you know what dimensions you need? We can get you quote. We have sold many of these.

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Kirk

my exaust comes out high on the transom, I will need at least 12" and they are 4.5" dia. what can you get me a set for?
larry

The typical is 12" down and 12" out. I havent quoted 4.5" in awhile. Will call CMI Monday for a price.

Have a great weekend.

Here you go 4.5" Gibson turn-downs. $500 plus shipping takes all four. PM me if you are interested. I paid $900 and had them on the boat for 15 hours.....decided that louder is better.

A few more pics

They are the 12" X 12" model (See Gibson's website for more details)

I only need 2, how much???

GLH here on the board is using them. pm him see how he likes them!

I started a similar thread in General Discussions before I found this one. GLH posted some pictures there.

Do you guys see any top end speed / rpm loss with the turndowns?