Another downpipe thread! - Ford Powerstroke Diesel Forum
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Old 03-13-2013, 08:58 AM
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Another downpipe thread!

Just need to know what the size of the stock downpipe is?

Noticed that Summit racing sells 3" and 4" 2 piece DP's. I got the stock "cobra" head right now and ready to hack the thing out and replace.

Sorry if this has been posted up many times but can't seem to search on here with my iPhone.

Many thanks in advance!
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Old 03-13-2013, 09:08 AM
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Unless you have a body lift, only a 3"-er will fit, and even that will take a minor mod to the cab.
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Old 03-13-2013, 09:11 AM
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Many thanks, that's just a straight swap and 3" at both flanges?
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Old 03-13-2013, 09:12 AM
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On my exhaust kit I'm pretty sure the down pipe is 3" until the flange where the cat would be, then the cat delete pipe goes to 4". I mean... if one was to run a cat delete pipe of course.
Making a 4" down pipe fit requires extensive firewall modifications. It's not worth it.
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Old 03-13-2013, 09:16 AM
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Assuming we are talking OBS truck, the outlet flange on the turbo is only 3". The 4" is probably for an SD 7.3 which has a 4" outlet.

The swap is not difficult... You have to either cut the pinch weld or bend it out of the way. Cutting the stock DP is the easiest way i have found to get them out.
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Old 03-13-2013, 10:19 AM
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Will be ordering this today, thanks for everyone's input. I got a decent 6' piece of 2" pipe ready to bend the firewall already.
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Old 03-13-2013, 11:01 AM
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I used an air hammer cut the pinch weld on both sides I needed to fit the dp, and bent it down, good luck with yours
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Old 03-13-2013, 01:53 PM
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I used a duck bill on a porta power to push the fire wall back. Makes life soooo easy.
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Old 03-13-2013, 05:18 PM
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Wink

Quote:
Originally Posted by superduty4x4 View Post
I used a duck bill on a porta power to push the fire wall back. Makes life soooo easy.
X2 on that, and you dont need to cut anything and no issues with future corrosion in the cuts.

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Old 03-13-2013, 05:23 PM
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Lightbulb

Quote:
Originally Posted by Rob73 View Post
Will be ordering this today, thanks for everyone's input. I got a decent 6' piece of 2" pipe ready to bend the firewall already.
Are you going to use your catalytic converter or your are going to dich it and install a 4" pipe?. FYI there are DP that goes from 3" to 4" in two pieces.



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