MBRP 4 or 5" exhaust? - Ford Powerstroke Diesel Forum
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Old 09-10-2013, 12:50 PM
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MBRP 4 or 5" exhaust?

I just bought an '06 six ohhh and it's all stock right now. I'm looking to fix that. First it's the exhaust.

Exhaust: I'm sold on MBRP turbo back exhaust, but should I go with the 4" or 5"? Is there any major difference in sound or is it just aesthetics?
And when I replace the exhaust, I'm going put in an egr delete kit as well, while I'm in there. Any opinions on which kit is best?
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Old 09-10-2013, 01:15 PM
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Hey man, welcome to the 6.0 group! I personally recommend the 5" turbo Back MBRP Straight pipe. I have the 4" down pipe and 5" down pipe back and I love it. I couldn't be any happier. I will post a link to video of my truck if your curious about the sound.
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Old 09-10-2013, 01:16 PM
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There is a link to my truck. I have a 03' turbo so it does whistle alot.
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Old 09-10-2013, 01:53 PM
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Thumbs up MBRP

Haha it does have a nice whistle to it! And yea I was leaning toward the 4-5" pipe, you just convinced me, that does sound sick
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Old 09-10-2013, 02:25 PM
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4" with a muffler.
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Old 09-10-2013, 05:44 PM
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personal preferance really... i love my 5inch
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Old 09-10-2013, 05:53 PM
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5" straight all the way, my only warning would be if you plan on hauling or you have emissions checks you may want to consider a high flow muffler for DOT stops... if not, enjoy the whistle and bark.
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Old 09-10-2013, 07:25 PM
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Love my 4"...can't go wrong with either though.
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Old 09-11-2013, 05:08 AM
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I thought I read somewhere that the 6.0 needs correct exhaust back pressure for the variable turbo vanes to work right, but it didn't really matter in a fixed vane turbo. Their summary was that 4" was a good choice for the 6.0, whereas 5" dropped the pressure too much. I also read that getting the 5" down pipe in can be a pain, possibly requiring firewall revision.

I can't find where I read it, nor do I know if it was correct information, but perhaps worth some research.

Last edited by ynpmoose; 09-11-2013 at 05:23 AM.
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Old 09-11-2013, 05:26 AM
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The 5" down pipe can be snug and believe that people were getting better performance going with a 4" down pipe. Now as far as the exhuast after the down pip I don't know if 4" or 5 " makes a difference. I run 4" from the turbo back and don't see a need for 5"


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