Custom 7.3 Y-pipe wanted
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Junior User
Joined: Jul 2008
Posts: 72
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From: Central Florida
Custom 7.3 Y-pipe wanted
What's the best way to have a new Y-pipe made for you? I want to put 3" mandrel bent exhaust on my '91 F250 7.3 (no turbo) but need a Y-pipe that's less restrictive. Ideas? Any plans or blueprints I can show a local exhaust shop to fab up for me?
Any metal/temp requirements?
I have a nice 3" exhaust from my old '93 Bronco (351W) and add more 3" tubing to make up the extra length needed from the Y-pipe back. It should fit fine over the rear axle since the F250 and Bronco both use the same layout.
Any metal/temp requirements?
I have a nice 3" exhaust from my old '93 Bronco (351W) and add more 3" tubing to make up the extra length needed from the Y-pipe back. It should fit fine over the rear axle since the F250 and Bronco both use the same layout.
Postmaster
Joined: Oct 2005
Posts: 3,724
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From: Clarksburg WV
You could either use this:
MagnaFlow 10778 - MagnaFlow Stamped Y-Pipes - summitracing.com
or this:
Cherry Bomb 429825 - Cherry Bomb Universal Y-Connectors - summitracing.com
and have a muffler shop build the other pipes...
Or, Walker also makes a "performance" y-pipe for their 7.3 n/a manifold back kit. Look up parts 55291 and 52273 at a parts place (rockauto.com has a schematic of the system). If you buy those two, it will cost you around $130 though, and it has a 2 1/2" outlet.
MagnaFlow 10778 - MagnaFlow Stamped Y-Pipes - summitracing.com
or this:
Cherry Bomb 429825 - Cherry Bomb Universal Y-Connectors - summitracing.com
and have a muffler shop build the other pipes...
Or, Walker also makes a "performance" y-pipe for their 7.3 n/a manifold back kit. Look up parts 55291 and 52273 at a parts place (rockauto.com has a schematic of the system). If you buy those two, it will cost you around $130 though, and it has a 2 1/2" outlet.
Posting Guru
Joined: Jun 2004
Posts: 1,808
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From: Cincinnati Ohio
I have been under the impression that 2.5 is the biggest you can use for the y-pipe because of how it mounts/bolts to the manifolds. I do remember there being a member on these forums,cant remember who though that made a less restrictive y-pipe, and also would build them for anyone at cost. The current y-pipe is very restrictive, and the way he makes it Ive heard helped him a lot...
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Junior User
Joined: Jul 2008
Posts: 72
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From: Central Florida
I have been under the impression that 2.5 is the biggest you can use for the y-pipe because of how it mounts/bolts to the manifolds. I do remember there being a member on these forums,cant remember who though that made a less restrictive y-pipe, and also would build them for anyone at cost. The current y-pipe is very restrictive, and the way he makes it Ive heard helped him a lot...
You could either use this:
MagnaFlow 10778 - MagnaFlow Stamped Y-Pipes - summitracing.com
and have a muffler shop build the other pipes...
MagnaFlow 10778 - MagnaFlow Stamped Y-Pipes - summitracing.com
and have a muffler shop build the other pipes...
GHunt - thanks for the MagnaFlow 10778 suggestion, that's a very good, doable idea. For it to work, the exhaust shop would have to fab 2.5" tubing from the exhaust manifolds to the 2.5" inlets on the Y-pipe itself, right? The Bassani Y-pipe I had on my Bronco (with matching Bassani shorty headers) was about 2.5 feet long.
Does anyone have pictures or exhaust diagrams to help me understand placement & sizing better?
Posting Guru
Joined: Aug 2006
Posts: 2,175
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From: Kent WA
I built one for my old NA truck (the one in my sig marked SOLD). Pretty easy to do, I have pictures and descriptions of what I did in my gallery. Here's a link
https://www.ford-trucks.com/user_gal...&albumid=25337
For the downpipes from the manifold, even 2.5" is pushing it. The stock collars that attach them to the manifolds are sized for 2.25" pipe., BUT you can use the downpipes and flanges from the stock Y-pipe (instead of cutting up a turbo crossover pipe like I did) and build one like mine with a few parts from Napa (2.5" pipe elbows 2 x 45s & 1 x 90, and a 4" to 3" adapter).
https://www.ford-trucks.com/user_gal...&albumid=25337
For the downpipes from the manifold, even 2.5" is pushing it. The stock collars that attach them to the manifolds are sized for 2.25" pipe., BUT you can use the downpipes and flanges from the stock Y-pipe (instead of cutting up a turbo crossover pipe like I did) and build one like mine with a few parts from Napa (2.5" pipe elbows 2 x 45s & 1 x 90, and a 4" to 3" adapter).
Posting Guru
Joined: Aug 2006
Posts: 2,175
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From: Kent WA
BTW, one thing I forgot to mention. Having a spare engine sitting around that you can use for mock-up makes it WAY easier to fit all the pipe pieces together the way you want them 
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New User
Joined: Dec 2008
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it'd be nice to add a pair of headerswith a new y-pipe. Are there any out there guys use that do not cost an arm-and-leg for our 7.3l?
I wonder if 460 headers could work...
I wonder if 460 headers could work...
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Postmaster
Joined: Oct 2005
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From: Clarksburg WV
Hey SuperKram- Since people are saying 2 1/4" is the max off the manifolds, why not use the Cherry Bomb y-pipe I posted? It's 2 1/4" in, 3" out.
Also on those y-pipes, down near the bottom in the description, it says the Magnaflow one is 10" long and the Cherry Bomb one is 13 1/4" long. The aftermarket ones are usually pretty compact to make them easier to fit.
Thread Starter
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Junior User
Joined: Jul 2008
Posts: 72
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From: Central Florida
Hey SuperKram- Since people are saying 2 1/4" is the max off the manifolds, why not use the Cherry Bomb y-pipe I posted? It's 2 1/4" in, 3" out.
Also on those y-pipes, down near the bottom in the description, it says the Magnaflow one is 10" long and the Cherry Bomb one is 13 1/4" long. The aftermarket ones are usually pretty compact to make them easier to fit.
Also on those y-pipes, down near the bottom in the description, it says the Magnaflow one is 10" long and the Cherry Bomb one is 13 1/4" long. The aftermarket ones are usually pretty compact to make them easier to fit.
Postmaster
Joined: Oct 2005
Posts: 3,724
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From: Clarksburg WV
Does it really look like that? I dunno, apparently Cherry Bomb doesn't have actual pictures of their stuff anywhere.
I imagine cherry bomb's y-pipe is similar to this one- standard Y 2.5" diameter (stanY2.5alz)
Also found this:
eBay Motors: FLOWMONSTER Y Pipe 3" X 2.25" Universal SU6-3 (item 380092742748 end time Jan-02-09 19:55:39 PST)
I imagine cherry bomb's y-pipe is similar to this one- standard Y 2.5" diameter (stanY2.5alz)
Also found this:
eBay Motors: FLOWMONSTER Y Pipe 3" X 2.25" Universal SU6-3 (item 380092742748 end time Jan-02-09 19:55:39 PST)
Post Fiend
Joined: Nov 2003
Posts: 21,285
Likes: 15
From: Nutter Fort, WV
2.25" is the pipe ID where it attaches to the manifold.
You could probably work on the clamp with a die grinder and get 2.5" pipe in it with a little time invested.
You would just have to look at bolt clearance and be careful you did not take out to much metal and make the clamp weak.
You could probably work on the clamp with a die grinder and get 2.5" pipe in it with a little time invested.
You would just have to look at bolt clearance and be careful you did not take out to much metal and make the clamp weak.
Lead Driver
Joined: Nov 2003
Posts: 6,900
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From: Campbell River, B.C.
Something else to consider, is that none of the turbo kits out there will bolt up to headers if you ever want to add a turbocharger. Adding a turbo will still blow the doors off anything with headers.
Post Fiend
Joined: Oct 2007
Posts: 10,501
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From: Faibanks Ak.
David somewon said stans website shows headers for 94 up. If so have they designed some that will work with a turbo. If so they would have the potential for some serious improvements over the stoch manifolds.