Mbrp downpipe - Ford Powerstroke Diesel Forum
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post #1 of 10 Old 07-20-2012, 01:05 PM Thread Starter
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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"

05 f250 crew cab short bed, 4" zone off road lift, 35x12.50xr17, eagle alloy wheels, young's farm service egr delete, ipr high flow coolant filter, 5" mbrp exhaust no kitty, SRL tune from gearhead, updated stc fitting, stand pipes, dummy plugs, and blue spring upgrade. and a lot of dreams.
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post #2 of 10 Old 07-20-2012, 01:13 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.

l BRYAN l


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Last edited by Tuscany; 07-20-2012 at 02:15 PM.
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post #3 of 10 Old 07-20-2012, 01:32 PM Thread Starter
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That would make sense. Thanks for the reply.

05 f250 crew cab short bed, 4" zone off road lift, 35x12.50xr17, eagle alloy wheels, young's farm service egr delete, ipr high flow coolant filter, 5" mbrp exhaust no kitty, SRL tune from gearhead, updated stc fitting, stand pipes, dummy plugs, and blue spring upgrade. and a lot of dreams.
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post #4 of 10 Old 07-20-2012, 01:35 PM
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Lol no problem.

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post #5 of 10 Old 07-20-2012, 02:10 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...

2003 F350 6.0L KR CCLB DRW 4x4 auto - bone stock
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post #6 of 10 Old 07-20-2012, 02:13 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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post #7 of 10 Old 07-20-2012, 05:07 PM
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4" DP on my 04 Excursion with literally no issues at install.

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439 rwhp/863 lb/ft.


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post #8 of 10 Old 07-20-2012, 06:04 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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post #9 of 10 Old 07-20-2012, 07:14 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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post #10 of 10 Old 07-21-2012, 06:15 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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