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Any Downsides To Downturns ?

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Old 04-28-2008, 10:55 PM
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Originally Posted by GLH View Post
Make sure you pressure test your headers it might not be your down turns.

I have never got issues with mine in about 120 Hours.
You missed my point , with engine failure they can cause
water to enter your heads , my defective valve springs
caused this , but can anyone think of a way to modify pipes to prevent this ?
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Old 04-28-2008, 10:56 PM
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Headers and tails almost new tested fine !
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Old 04-29-2008, 01:08 AM
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You could always customize some flappers if you are that worried about it.
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Old 05-26-2009, 01:08 PM
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Make sure you pressure test your headers it might not be your down turns.

I have never got issues with mine in about 120 Hours.

What kind are those and where did you get them??
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Old 05-26-2009, 02:55 PM
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I had a set on my last boat had no issues, really helped. However I was a little concerned with the extra force (vibration) that was being applied to the exhaust tips which could be transmitted up through to the headers. I weighed mine and did some math on the theoretical force being applied through leverage (lost the napkin) and it turned out be more than I expected. Concerned with long term effect, if any.
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