Mbrp downpipe - Ford Powerstroke Diesel Forum
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Old 07-20-2012, 12:05 PM
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Mbrp downpipe

I just got a mbrp 5" turbo back exhaust. And I was just wonderin if there was a reason why they only make 3.5" down pipes instead of a 4"
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Old 07-20-2012, 12:13 PM
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Because you have to beat your firewall in to get the 4" dp to fit. Also the 4" is overkill unless you have supporting mods necessary for a bigger dp. Eg; injectors, turbo, exhaust headers etc.

Last edited by Tuscany; 07-20-2012 at 01:15 PM.
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Old 07-20-2012, 12:32 PM
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That would make sense. Thanks for the reply.
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Old 07-20-2012, 12:35 PM
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Lol no problem.
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Old 07-20-2012, 01:10 PM
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I just wanted to add that I have a 4" DP on my Magnaflow exhaust and I didn't have to beat or modify anything to get it to fit...
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Old 07-20-2012, 01:13 PM
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I have a 4" on mine and I didn't either but some people I know personally had to beat theirs in to get it to fit but they also had 2003's and 2004's so maybe it was different then.
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Old 07-20-2012, 04:07 PM
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4" DP on my 04 Excursion with literally no issues at install.
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Old 07-20-2012, 05:04 PM
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My '04 has a ZF6 and the 3.5" MBRP pipe is VERY tight between the back of the starter boss on the bellhousing, frame, and firewall seam. I think that if a manufacturer could be bothered to make a special downpipe for the manual transmission trucks, a 4" might be OK. Problem is that it's a small market segment, so volume would probably be too small to make it worthwhile. It's so much easier to market a 3.5" downpipe that fits everything poorly, and a 4" labeled "automatic transmissions only." At only a little over $200 for the whole system I can't complain too loudly, but will probably try to do something different if/when it needs to be replaced.
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Old 07-20-2012, 06:14 PM
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My 4" diamond eye went in without any problems and so did the rest of my 5" exhaust.
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Old 07-21-2012, 05:15 AM
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Motor placement, cab placement from the factory will make a difference. MBRP could have the bend off the turbo just a tad less then other exhausts. FWIW I doubt anyone has a setup that will not flow properly with a 3.5" exhaust.
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