AaronH

iTrader: (2)

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.

Thanks

67RSCamaroVette

iTrader: (63)

couldn't you cut up a stock Y-pipe? you could prob have one for just the cost of shipping..

AaronH

iTrader: (2)

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. ????

Thanks

shr00m-dew

iTrader: (28)

Bump because I know they exist, forgot to bookmark the page, and now need some too.

Kevin D.

Cop Car

iTrader: (14)

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

jeepinpete

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...

AaronH

iTrader: (2)

From looking at pics of 98-99 manifolds, I don't think they would work in my jeep-dumps too far back.

shr00m-dew

iTrader: (28)

I think he meant cut the flanges off the 98's, turn them around and bolt them up.

Kevin D.

fast377

iTrader: (52)

Actually you can buy flanges to bolt right up. A standard 2.5" header collector will bolt directly to the ls1 manifolds.

fast377

iTrader: (52)

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.

larrys project

iTrader: (1)

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.

AaronH

iTrader: (2)

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

jeepinpete

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.

89lx-ls1

iTrader: (23)

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.