4" downpipe-back exhaust - Ford Powerstroke Diesel Forum
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Old 08-13-2008, 05:38 PM
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4" downpipe-back exhaust

I've decided to cut right before the coupler on the downpipe, then run flex until I can get a straight shot with 4" steel pipe to the stack kit. I figure this should be a dramatic increase over the 3.5" pipe with the giant gay flange. I'm shooting for less back pressure, free'd up HP, and maybe possibly like .0001 better mpg I'll post pics tomarrow when I finish
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Old 08-13-2008, 05:39 PM
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think biggest thing youll gain out of it is lower EGTs
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Old 08-13-2008, 05:41 PM
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Cool. Look forward to the pics.
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Old 08-13-2008, 06:10 PM
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I dont know if she'll be purty, but at least she'll be 4 inches in diameter
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Old 08-13-2008, 06:17 PM
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Quote:
Originally Posted by Goolsbymd View Post
think biggest thing youll gain out of it is lower EGTs

That would def be an added bonus
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Old 08-17-2008, 06:36 PM
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Here's some pics guys



















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Old 08-17-2008, 06:41 PM
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sweeeeeeetttttt!!!!!!!!!!!!!!!!!!!
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Old 08-17-2008, 06:45 PM
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when were you in DC and why didnt you tell me!!!

im 15 minuets from there!!
WTF
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Old 08-17-2008, 06:48 PM
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Quote:
Originally Posted by george.ratliff View Post
when were you in DC and why didnt you tell me!!!

im 15 minuets from there!!
WTF
Aw man sry bro I left yesterday at like 3 ish and got back home in PA around 2 ish today. It was kind of a spur-of-the-moment thing.
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Old 08-17-2008, 07:48 PM
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looks good have you notice any differance on the egts? I did the same thing but modified a 4" pipe from the coupler to make the bends to the crosmember then went to a 5" straight pipe with 6" tip my egts are 1200 at the max with the sct 1.22 tune and great sound.






i
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