Should The Down Pipe Be Replaced? - Ford Powerstroke Diesel Forum
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Old 11-16-2010, 06:13 PM
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Should The Down Pipe Be Replaced?

I am getting ready to install a Black Maxx and looking at going with a 5" exhaust for a deeper sound. I was wondering if the factory down pipe is badly crimped and should be replaced, or if there is not enough improvement to replace it versus expense? I realize it may lower exhaust temps slightly, but didn't know if it would help with acceleration too. Any info would be greatly appreciated!

-Funkster-
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Old 11-16-2010, 06:17 PM
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It is a very worth the money mod in my opinion. Only issue is you have to cut the stock downpipe out unless you pull the cab or slide the transmission over some. The install of the 4" aftermarket pipe is not nearly as complicated as getting the stock one out.
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Old 11-17-2010, 04:12 AM
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If you plan on keeping your warranty, hold off on the downpipe. But if you don't care about the warranty, then the downpipe is well worth doing. Anything you can do to make the truck breathe easier will help make power.
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Old 11-17-2010, 08:25 AM
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So I guess my next question would have been if the factory exhaust would bolt up to the new downpipe, but since it's larger, that would be a no I'm assuming. that part about it hadn't hit me yet. lol Guess I'll just go with the 5" flo pro exhaust system downpipe back. Thanks!

-Funkster-
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Old 11-17-2010, 10:21 AM
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If you have an EGT issue or are trying to get every little bit out of the truck then yes, it is worth it. Most people find it is not necessary to swap out though.
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Old 11-17-2010, 03:45 PM
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where is the best palce to buy a down pipe and exhaust manifold for a 2008 6.4 diesel ?
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Old 11-18-2010, 04:43 AM
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Quote:
Originally Posted by Funkster View Post
So I guess my next question would have been if the factory exhaust would bolt up to the new downpipe, but since it's larger, that would be a no I'm assuming. that part about it hadn't hit me yet. lol Guess I'll just go with the 5" flo pro exhaust system downpipe back. Thanks!

-Funkster-
The 4" downpipe bolts directly to the rest of the exhaust system.
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Old 11-18-2010, 04:48 PM
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Yes, but would the 4" downpipe bolt up to the factory exhaust as well as a 5" exhaust?

-Funkster-
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Old 11-18-2010, 07:37 PM
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Yes it has the same bolt on flange!
Chris
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Old 11-18-2010, 07:48 PM
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Quote:
Originally Posted by Funkster View Post
Yes, but would the 4" downpipe bolt up to the factory exhaust as well as a 5" exhaust?

-Funkster-
The 5" exhaust systems reduce down to 4" right before the transmission cross-member in order to clear it. The way the aftermarket downpipes are made, they can bolt to any size exhaust as long as it has the flange on it.
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