Internal exhaust flappers?

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05-11-2017 | 10:02 AM

#11

getrdunn

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Joined: Feb 2009

Posts: 8,356

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From: NW Michigan

Quote:

Originally Posted by VoodooRob

Why don't you take the tips off the boat and have a local custom exhaust fabricator swage the ends to 4"? That way you will have options.

Was going to mention that also.

05-11-2017 | 06:04 PM

#12

Hardin Marine

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Joined: Nov 2004

Posts: 266

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From: Palm Coast, FL

Quote:

Originally Posted by nova26

I've seen a lot of 4in stuff but not much on 3 1/2.

For externals I like these from Harden but I can't find them in 3 1/2 inch

We can probably custom build these in 3.5". PM me If interested and l can quote you a price.

05-12-2017 | 01:03 PM

#13

nova26

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Joined: Oct 2007

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From: Rolla/LOTO MO

Quote:

Originally Posted by Hardin Marine

We can probably custom build these in 3.5". PM me If interested and l can quote you a price.

PM sent

05-12-2017 | 02:59 PM

#14

Baja Rooster

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Joined: Oct 2013

Posts: 2,888

Likes: 148

From: SF Bay Area

I put on Hardin tips with the internal rubber flaps and was surprised at how much they still clanked. I took them out and just stuck with the rubber ext flaps.

05-14-2017 | 02:23 PM

#15

Dmac88sport226

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Joined: Aug 2014

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I bought those same flappers from cp performance. Haven't used them yet. I have stock 88 brass tips and I had to have them machined down inside and outside to fit. I hope that they will be ok. I'm putting the motor back together and I bought a set of stainless marine manifolds and tailpipes. I hope it works. I didn't want the butterfly flaps since they fall apart so I figured I would try it. Do they restrict the exhaust flow that much?