4" downpipe possible? - Ford Powerstroke Diesel Forum
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post #1 of 14 Old 06-11-2012, 03:13 PM Thread Starter
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4" downpipe possible?

Ok I have read up a bit. But form what I gather its hard to fit.. Well I have an E350. So getting to the back of the motor is easy. I opened up the dog house and it looks like it wouldn't be so bad fitting the 4". So any insite on this would be awesome.. Another question is. Where can I get a 4" down pipe. Will the late model down pipe work?
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post #2 of 14 Old 06-11-2012, 06:27 PM
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Smile downpipe

I GOT A MBRP 4 INCH TURBO BACK PERFORMANCE SYSTEM BUT THE 4 INCH DOWNPIPE WAS FOULING GEAR BOX, SO FITTED ORIGINAL 3.5 DOWNPIPE BACK ON AND INTO THE REST OF 4 INCH SYSTEM AND ITS WORKING JUST FINE. NICE RUMBLE, NOT TOO LOUD BUT CAN FEEL THE EXTRA HP AND TORQUE
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post #3 of 14 Old 06-11-2012, 07:08 PM
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dude you are kinda on your own with a van. Idk anyone on here who has done anything with those. But hey be a pioneer and let us know how it works!

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post #4 of 14 Old 06-11-2012, 08:21 PM
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not here to burst bubbles but..... your stock turbo outlet is 3 inch. what do you expect to gain from a 4 in dp when you have a 3 inch restriction right at the source?

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post #5 of 14 Old 06-11-2012, 08:24 PM
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BTW..... PSD vans are the schizzle

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post #6 of 14 Old 06-12-2012, 04:25 AM Thread Starter
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Originally Posted by rocksmearer View Post
not here to burst bubbles but..... your stock turbo outlet is 3 inch. what do you expect to gain from a 4 in dp when you have a 3 inch restriction right at the source?
Well its like being in traffic. Two lines its backed up. But as soon as it opens up to 4 line it clears up. The same concept with moving exhaust. The shorter amount of time stuck in a tight area the better... And to answer your question I expect to gain lower EGT's.

BOB-you wouldn't happen to have the part number for that kit do you?

kanuck15 - Yeah I know, Thats why im just looking for a down pipe. I will build the rest of the exhaust myself. Im also planing to install a 6.4L IC.

I'm not looking for to make big power. But my van is heavy and I'll be towing alot. So im just trying to get the EGT's low and maybe help out with towning.

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post #7 of 14 Old 06-12-2012, 05:57 AM
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I guess your best bet is to buy one and find out. Might as well get a porta power, sawzall, and a welder while you're at it. But who knows, it may bolt right up

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There u go Tom. John may not be sexy, but he can tutor you, lol.
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post #8 of 14 Old 06-12-2012, 09:36 AM Thread Starter
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Originally Posted by atvrider93 View Post
I guess your best bet is to buy one and find out. Might as well get a porta power, sawzall, and a welder while you're at it. But who knows, it may bolt right up
Check, Check, and Check..
I not trying to be a-hole or act like I know everything. Sorry if I came off that why. But this is my thing. If the turbo outlet is 3" and going to 4" after the outlet isn't going to make a difference. Then why even go to 4" or even 5" after the the dp? Its the same concept... And actually right after the turbo the gases are hotter, so less dense. They cools as it travels so they moves more freely. So you want more room up top.
Im just wanting to know has anyone done it? If so how? What exhaust did they use or did theymake they're own...
Thanks Guys

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post #9 of 14 Old 06-12-2012, 10:48 AM
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You are fine man, We get what ya mean. But you may be the first to want to try this. I dont know how it would work or what it even looks like under a van

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post #10 of 14 Old 06-13-2012, 05:53 AM
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So does the 4" downpipe bolt up to the turbo or do you have to use the flange from a 3" downpipe? I would actually like to try a 3.5", no way I could fit 4" though

Sent from my DROID BIONIC against my will

1996 F350 4x4 CCLB-- I'll miss her

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6637
OBA w/horn
DE 5"
PHP tunes
Mud Country 315/75/16

2008 Wr250X

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Originally Posted by belz View Post
There u go Tom. John may not be sexy, but he can tutor you, lol.
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