4" down pipe not needed? - Ford Powerstroke Diesel Forum
6.0L Performance Parts Discussion What has or has not worked for you?

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post #1 of 17 Old 03-24-2011, 05:01 PM Thread Starter
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4" down pipe not needed?

I called performance truck products today to order a mbpr exhaust kit but they said they dont make it with a 4" dp and it wasnt necessary anyway. If thats the case what would be the advantage of even getting a 4" exhaust in the first place since the factory dp is already 3.5" which is the same as the mbpr one. maybe i should just delete the muffler and cat and call it good then?
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post #2 of 17 Old 03-24-2011, 05:06 PM
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that would work

2008 6.4 f250 lariat 4wd
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post #3 of 17 Old 03-24-2011, 05:15 PM
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A 4" pipe doesn't gain you as much cost-to-benefit to manufacture as a 3.5", its also harder to fit on the 6.0L (some have issues, others don't depending on where you get the pipe). Going to a 4" pipe from the DP to the exhaust increases airflow, but more importantly lowers EGT's. There are quite a few members on here who have simply cut out their CATs and Mufflers, and have been perfectly happy with it.

Last edited by colo_dually; 03-25-2011 at 07:38 AM. Reason: I stand corrected.
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post #4 of 17 Old 03-24-2011, 05:58 PM
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I thought the stock exhaust was 3.5 and the down pipe is 3"....

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post #5 of 17 Old 03-24-2011, 06:06 PM
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thats what i thought too......
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post #6 of 17 Old 03-24-2011, 09:49 PM
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I'm running the stock piping on my 03 with muffler and cat deletes, love the way it sounds and turbo spool it a tad quicker! Very pleased!

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post #7 of 17 Old 03-24-2011, 10:14 PM
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yea i think the stock dp is only 3inch.......
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post #8 of 17 Old 03-25-2011, 03:27 AM
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Hey wildstyle u got any sound clips of your exhaust?

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post #9 of 17 Old 03-25-2011, 07:03 AM
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CORRECT! The OE downpipe is only 3". It is not 3 1/2", from the cat and beyond is 3 1/2". ALSO, the OE downpipe IS NOT double walled.

So many mis informed people on this website that post useless information.

About half of the exhaust systems found on the market use a 3 1/2" downpipe. I can name two that for fact offer a genuine 4" downpipe.

DiamondEye

Summit racing


I have heard of others but don't recall since I have not used their product. Both that I just mentioned have excellent fitment with ZERO clearance issues that so many babble on about on this site.

Babbling,,,,,,,,, all myths about back pressure are FALSE! Wrap your head around turbo charged/forced induction internal combustion engines and combine with quality research. Their are many good posts on this website about the argument with enlightenly useful answers. You just have to look not quickly scan for an easy answer.

I have full deletes, tunes, and a diamond eye 4" downpipe leading out to a 6" stack, no muffler and everything performs perfect on my truck. Everything is fine on my dads '06. All he has is tunes and 4" full exhaust. Runs great, before and after he had tunes.

Stock sucks
More torque pleeze

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post #10 of 17 Old 03-25-2011, 07:09 AM
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Yup. I have diamond eye 4 inch turbo back for an awesome price. What he said above is true. The stock exhaust with deletes will be fine but slot of people get the bigger 4 and 5 inch because of sound. Some say with just the deletes on stock piping the sound is kinda raspy but if u go 4 or 5 inch it gives it a deeper tone and lower egt's
Straight pipe is the best upgrade that won't risk hurting ur truck and u get awesome sound. Good luck

T-rav
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s467 MPD single kit, H&S Jesse Byall tuning, No limit IC piping and intake,mishimoto intercooler, MPD billet CCV/oil filler, FASS with sump, SOTA A.W.O.L. polished wheels, toyo rt tires, RED Newton traction bars, oem projector retrofit and a bunch of LED lights LOL

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OUR FLEET: 2015 f450, 2014 Platinum F350, 2012 F450 6.7, 2010 F350 6.4, 2005 F350 6.0, 04 F450 6.0
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