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X-pipe for headers?

 
Old 09-08-2007, 09:58 PM
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Default X-pipe for headers?

Two questions for the motor heads out there.

Getting the last of the parts together for the hybrid install. I have decided to ditch the '85 manifold and my Y-pipe for a set of MSDS Headers. Does anyone make a X-pipe to fit the headers, or am I looking at getting a muffler shop to make one?

Also I am currently having the heads worked. (Porting intake and exhaust, new valve seals, laped valve seats etc.) Does anyone know the inside diameter of the MSDS header and it's gasket? Or how much it varies from stock. I'm having the heads gasket matched on the exhaust ports but I gave the machine shop a stock '85 gasket to work with before I decided to upgrade to the headers.

Unfortunately it will be next week before I can order the headers from Carl. Just don't wan't to delay the shop.
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Old 09-08-2007, 11:10 PM
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I am looking for an x pipe for Devek LII headers as well. Different than your headers, but its the same idea that the current X-pipes would need to be rebuilt or customized.

I am only aware of this being custom done, such as with Sterling and a few others.
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Old 09-09-2007, 01:35 AM
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Thanks. Hadn't considered the Devek headers since I can't seem to get the Devek site to load. Is it still down?

What are the advantages of the Devek headers over MSDS?
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Old 09-09-2007, 01:58 AM
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928 international also sell headers from time to time, might be worth checking with them. i have devek level 2 headers (yet to be installed) and ive had an X made up in 3" diameter by burns stainless -check there website.
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Old 09-09-2007, 11:26 AM
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The only headers really available these days are MSDS and 928intl long tube headers.

Sterling - how did you measure for burns stainless?
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Old 09-09-2007, 02:08 PM
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Not seeing the headers on 928intl, are they not a standard item? Are there advantages of the long tube headers over the MSDS?
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Old 09-09-2007, 05:45 PM
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If someone wants to have something made for the Devek II headers I'd be interested. Something that would bolt to the collectors and allow connection to 3" pipe with some O2 bungs would be nice.

BTW, headers want a different crossover point, probably 1 or 2 feet further back than works for manifolds.

Terra, don't try to "gasket match" the exhaust port. A step doesn't hurt and may even be desired, well assuming its stepping bigger into the headers that is.
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Old 09-09-2007, 05:49 PM
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Originally Posted by Sterling View Post
How did I measure what?
I just meant was it an off-the-shelf item or did you take any measurements for width or length before talking to burns.
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Old 09-09-2007, 08:08 PM
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Originally Posted by Sterling View Post
Better build quality, mandrel bends which flow better, a true collector with a venturi.

Here are some pics of mine:

http://www.928sg.com/exhaust.htm

I had to make some changes to them for fitment purposes because I have a very steep pointed crown on my driveway and I wanted to tuck them up inside the area between the body and lower bell housing more.
Sterling, Thanks! Do you remember roughly the cost for the 928 headers. They are very nice indeed. I guess I'll shoot Mark an email since I don't see them on the site. Perhaps they only order a run when there is enough interest?

Also what did the burns "X" run you? I like the look of it as well. I'm trying to stay this side of reality for the budget, but I also don't want to spend the money twice by going cheap and not being satisfied.
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Old 09-09-2007, 11:20 PM
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So about $400 more than the MSDS. DO you really think there will be a big difference in hp/torque for the 928 headers vs the MSDS? They look much better designed, just not sure of the return on investment. Seems like both will be a drastic improvement over the '85 exhuast and Y-pipe I have now.
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Old 09-10-2007, 09:40 AM
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My MSDS headers are now installed so I am also looking for an X-pipe that will bolt up to them.
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Old 09-10-2007, 11:11 AM
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Originally Posted by Sterling View Post
The challenge with headers is that they are usually not manufacured to the tightest tolerances like factory manifolds & I'm guessing that is why no one offers a pre made X for them.
Sterling, that is likely true. There can't be that many cars out there running the exact system that I am looking for. I can do the fab work but has anyone already figured out the optimal length/position for the "X" for use with MSDS headers?
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Old 09-10-2007, 11:26 AM
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Originally Posted by Sterling View Post
The challenge with headers is that they are usually not manufacured to the tightest tolerances like factory manifolds & I'm guessing that is why no one offers a pre made X for them.
Recently at the local 928 shop there were three 928's all up on lifts with MSDS headers. Two 16V's and one S4. It was pretty obvious not one exhaust system would unbolt and fit on the other cars. The collectors were all pointing slightly in different directions.
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Old 09-10-2007, 11:35 AM
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I would love to see the engine gains from long tube headers with the off the shelf X merge versus factory tubular header with a well designed x-pipe. The angles and cross section on the burns would certainly be wrong for a stock style car. I suspect there is a lot of improvement that could be made on that unit. Sure would be neat to see some before and after numbers.
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Old 09-10-2007, 09:12 PM
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mike, why does the X need to be further back with headers?
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