3.5" or 4" Turbo Downpipe?? - Ford Powerstroke Diesel Forum
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Old 10-11-2012, 07:23 AM
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3.5" or 4" Turbo Downpipe??

I have a 05 excursion. Should I get a 3.5" or 4" turbo downpipe? I will have a 4" volant ss exhuast with no cat.


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Old 10-11-2012, 08:37 AM
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Go big or go home....
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Old 10-11-2012, 10:57 AM
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The bigger one is better to keep you egts low. That's what I have.

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Old 10-11-2012, 11:00 AM
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If the 4 inch will fit go with that I had to use a 3.5 because I have a manual trans and didn't want to pinch the pipe. But either way you'll enjoy your whistle even more


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Old 10-11-2012, 12:45 PM
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You'll have firewall interference issues with the 4", heck, I even get occasional vibration on the firewall with my 3.5". The 3.5" is a huge improvement over stock and larger than the turbo outlet, no reason to go bigger.
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Old 10-12-2012, 09:02 AM
War is the answer!


 

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It was a pita getting it in there but it's not rubbing or vibrating on anything.

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Old 10-12-2012, 10:31 AM
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I had no problems getting the 4" in and I havent had any vibrating after the first day. I had to tweak it a couple times to get it in the correct spot
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Old 10-14-2012, 05:44 AM
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I looked at my down pipe. The previous owner put a 4" magnaflow exhaust with cat delete on. It also looks like he did a 3.5" down pipe. All the bends are completely smooth. So I don't gotta buy one now


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