Exhaust Question 2001 7.3 - Ford Powerstroke Diesel Forum
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Old 10-04-2008, 11:38 AM
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Exhaust Question 2001 7.3

Guys,

Hoping for a little help. I just picked up a 4" turbo back SS Dynomax exhaust and am looking at the exhaust on my truck and trying to determine if it's already been upgraded at some point. What I'm measuring is a 3 1/2" diameter pipe. The down pipe is 3" and about a foot after the down pipe turns 90 to the rear of the truck it transitions to 3 1/2" from there back and does have a muffler in line. Would this have been standard? If not, will I really see much benefit by going to the 4" turbo back I have? Finally, should I just move to a 3 1/2" down pipe and tie in to the existing system? Thanks!
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Old 10-04-2008, 01:18 PM
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sounds like you have stock exhaust.You should see lower egt's with the new exhaust and might even feel a little stronger.
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Old 10-04-2008, 02:53 PM
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Yes that is the stock set-up. I took mine in to have it straight piped and told them i needed three feet or so of 3" put in place of muffler and was corrected , he told me it was 3-5/8 and ended up welding in a piece of 4" as that was all he had available. Seemed to be a little more responsive after the straight pipe though. Let us know if you put it in and notice a diff. in EGT temps.
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Old 10-04-2008, 06:06 PM
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I'll be doing the exhaust sometime in the next couple weeks and will post results. Thanks for the help.
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