Sinister Solid Y-Pipe - Ford Powerstroke Diesel Forum
6.0L Performance Parts Discussion What has or has not worked for you?

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post #1 of 26 Old 12-24-2012, 07:23 PM Thread Starter
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Sinister Solid Y-Pipe

Anyone used this setup in order to get rid of the stock and prone to crack flex joints? If so, how do you like them and would you recommend them?
Sinister Exhaust Y Pipes Ford Powerstroke Diesel 6 0L 2003 2007 | eBay

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post #2 of 26 Old 12-24-2012, 07:47 PM
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i think its a terrible setup. You need to have bellows in that part of the exhaust due to the vibration. The sinister y-pipe in time will crack. Send your factory y-pipes out to get heavy duty flex joints with them ceramic coated and you now have a bullet proof set-up

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post #3 of 26 Old 12-24-2012, 07:50 PM
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I have not seen this before.I have their coolant filter and has been great. Hopefully someone will chime in about this product, it looks to be a great product.
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post #4 of 26 Old 12-24-2012, 07:52 PM Thread Starter
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Quote:
Originally Posted by 04cr450 View Post
i think its a terrible setup. You need to have bellows in that part of the exhaust due to the vibration. The sinister y-pipe in time will crack. Send your factory y-pipes out to get heavy duty flex joints with them ceramic coated and you now have a bullet proof set-up
Where can I do that? I think I've narrowed my noise down to the y-pipe and I'm seriously tired of chasing it. Want it fixed, and fixed right.

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post #5 of 26 Old 12-24-2012, 07:57 PM
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The main reason for the flexjoint is not for vibration. The turbo is mounted to the same thing that moves/vibrates. The reasoning for the flexsection is for the expansion and contraction from the high temperature differences. As the pipes heat up they swell/lengthen and shorten as they cool down. only a fraction of an inch but enough that could damage/crack welds and cause issues at sealing joints.

The bellows aren't that bad of a design. At least we dont have a slip joint manifold that only seals after the engine finally gets hot

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post #6 of 26 Old 12-24-2012, 08:06 PM
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Take a look at the RCD y pipe, that looks like a nice piece.

[IMG][/IMG]Casey
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post #7 of 26 Old 12-24-2012, 08:38 PM
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These look like a slip joint design as well.

Ive got IDP's long Y pipe on my truck.
Great fit and finish.

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post #8 of 26 Old 12-24-2012, 09:11 PM
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Quote:
Originally Posted by rentstdi View Post
The main reason for the flexjoint is not for vibration. The turbo is mounted to the same thing that moves/vibrates. The reasoning for the flexsection is for the expansion and contraction from the high temperature differences. As the pipes heat up they swell/lengthen and shorten as they cool down. only a fraction of an inch but enough that could damage/crack welds and cause issues at sealing joints.

The bellows aren't that bad of a design. At least we dont have a slip joint manifold that only seals after the engine finally gets hot
Exactly right. You do not want solid up pipes for the reasons given above. Have stainless flex sections welded into your stock pipes to replace the oem bellows. Any muffler shop should be able to do it if you give them the flex sections.
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post #9 of 26 Old 12-24-2012, 09:32 PM Thread Starter
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Where could I get quality stainless sections? I only wanna do this once.

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post #10 of 26 Old 12-24-2012, 09:51 PM
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Quote:
Originally Posted by 04cr450 View Post
i think its a terrible setup. You need to have bellows in that part of the exhaust due to the vibration. The sinister y-pipe in time will crack. Send your factory y-pipes out to get heavy duty flex joints with them ceramic coated and you now have a bullet proof set-up
The bellows are there to aid in installation so you can flex them to get the joints to mate up properly to seat. The solid y-pipe doesn't allow that. It also will not crack over time, think about it, what is the y-pipe mounted to? The manifolds and the turbo. What are the manifolds mounted to? The heads. What is the turbo mounted to? The pedestal. All of which is solid mounted without any sort of flex points and also being that they are all mounted to the same solid area than they will all move together, therefore the flex in the bellows is only to allow for easier installation.

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