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Exhaust Flanges?

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Old Apr 27, 2006 | 01:26 PM
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Default Exhaust Flanges?

I'm using 2002 F-body factory manifolds and I would like to run dual exhaust on my jeep conversion. Apparently I can't just buy flanges to bolt pipes to the manifolds. Can anyone please help with some ideas or know a place to buy flanges.

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Old Apr 27, 2006 | 03:02 PM
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couldn't you cut up a stock Y-pipe? you could prob have one for just the cost of shipping..
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Old Apr 27, 2006 | 04:50 PM
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Default y-pipe

I have not seen one personally, but it sounds like the cat bolts to the manifold. In any case, each manifold uses a different size three bolt flange. I thought about the y-pipe idea also, but the description of the flanges from the guy I was going to buy them from made it sound like they were not what I needed. ????

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Old Apr 27, 2006 | 07:33 PM
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Bump because I know they exist, forgot to bookmark the page, and now need some too.

Kevin D.
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Old Apr 27, 2006 | 07:37 PM
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i would think that you could get some 98-99 manifolds and cut off the flanges... they arent like the full cast manifolds of 00-02 cars, they actualy have flanges that could be seperated. ive been thinking about it for my 240Z swap
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Old Apr 27, 2006 | 09:17 PM
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I'd love to know where to get them too. I have the truck manifold and y pipe, but the driver side dumps right into the frame rail. I just received a set of F-body manifolds, which will solve the problem nicely, if I can get a flange for it...
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Old Apr 27, 2006 | 09:36 PM
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Default 98-99 manifolds

From looking at pics of 98-99 manifolds, I don't think they would work in my jeep-dumps too far back.
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Old Apr 27, 2006 | 11:11 PM
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I think he meant cut the flanges off the 98's, turn them around and bolt them up.

Kevin D.
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Old Apr 27, 2006 | 11:16 PM
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Actually you can buy flanges to bolt right up. A standard 2.5" header collector will bolt directly to the ls1 manifolds.
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Old Apr 27, 2006 | 11:18 PM
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Originally Posted by Cop Car
i would think that you could get some 98-99 manifolds and cut off the flanges... they arent like the full cast manifolds of 00-02 cars, they actualy have flanges that could be seperated. ive been thinking about it for my 240Z swap
Only one side can be seperated...I believe it's the passenger side if I remember correctly. The way the driver side is made you don't have enough primary sticking out to weld to. But it's more trouble than it's worth. You can buy the header flanges for like $30. Been down that road.
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Old Apr 29, 2006 | 11:42 PM
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to the top, cause I am looking for the same Aaron. I have what I believe is a set of 98 F body manifolds, both are cast iron, with different size bolt flanges.
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Old Apr 30, 2006 | 09:58 AM
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Default Flanges done

Well here is what I did for mine. I used the manifold with the smaller triangle bolt pattern as a template and had two flanges cut at a steel shop from 1/2 inch steel. They used a water cutting machine so there was no heat warpage. I had them also cut the hole for the exhaust pipe at the same time. I used the old gasket as a template, lined up the holes for the exhaust pipe and drllled stud holes in the flanges. I drilled the holes the same in each flange so the same gasket could be used. I then lined up the flange on the manifold the has the big triangle bolt pattern and drilled new holes in this manifold and tapped them for studs. Tada done !!

Fast377-I don't understand how header flanges would work on these manifolds. Or should I say at least one of them. One of my manfolds has a very large non-90 degree triangle bolt pattern that a header flange would definitely not bolt up to. I did not check, but I suppose the other manifold could very easily use a header flange. One other thing, at least for myself, is I wanted a setup that would stay sealed and in my experience header flanges tend to need more attention over time for exhaust leaks.

BTW- There are some flanges listed at Stainless Works, but I did not investigate them. They may be flanges for building headers and bolt to the head. There are no images to look at.
http://www.stainlessworks.net/cart/i...ath=95_131_132

Aaron
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Old May 1, 2006 | 08:47 AM
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I can second that. I picked up some SS type manifold for a ~'99 F-body, and again, there is no way a header flange is going to cut it. My intention is to use the header flange on the y-pipe, and drill the pattern into the exhaust manifold flange. There is more than enough material to do this.
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Old May 1, 2006 | 09:12 AM
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I have the flanges that came with my adapter kit form advance adapters and i didnt use them since i put long tubes on my car so i will sell them if you want them pm me for more info.
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