3.5 vs 4.0" downpipe for the 6.0 - Diesel Forum - TheDieselStop.com
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Upgrades and Aftermarket - 6.0L Engine Upgrading or adding OEM or aftermarket equipment to your 2003-Up Super Duty or Excursion with 6.0L Power Stroke diesel engine. Please confine discussion of topics in this forum to those items that are specific to the 6.0L Power Stroke engine.

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Old 11-09-2004, 09:51 AM   #1 (permalink)
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3.5 vs 4.0" downpipe for the 6.0

who has what?

I've presently got a 3.5" downpipe, but have a friend who's looking and (fairly convinced) the he needs a 4" one on his 6.0.

Is there any real world difference? (besides having to modify the firewall to make it fit on some trucks)
-T
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Old 11-09-2004, 10:11 AM   #2 (permalink)
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Re: 3.5 vs 4.0" downpipe for the 6.0

4" here. cant give a 4 vs 3.5 comparison though, because i did the whole exhaust at once. much better turbo response though. and yeah, it did take come cutting to get rid of the rattles. sorry i cant help you more. i would suspect some of the sponsors will be most informative as they probably sell both...
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Old 11-09-2004, 10:49 AM   #3 (permalink)
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Re: 3.5 vs 4.0" downpipe for the 6.0

Call Mark @ DPPI. He can give you more information about all of the pluses and minuses.

Duke Jim
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Old 11-09-2004, 11:31 AM   #4 (permalink)
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Re: 3.5 vs 4.0" downpipe for the 6.0

IMO, you would probably gain some type of performance advantage if you had a straight pipe. Otherwise, it might not be worth the hassle.
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Old 11-09-2004, 11:42 AM   #5 (permalink)
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Re: 3.5 vs 4.0" downpipe for the 6.0

here is a quote from mark @ DPPI on another thread entitled downpipe ?

he is responding to my comment that the 3.5 inch fit better and adding to it, here it is

"Not only do they fit better but the 4 incher I had when we first started to prototype the 6.0 system did no better flow wise or EGT wise either, the only thing it did better was make your life miserable while you were tryiong to install it!!!!

We have down pipes in 3.5 in aluminized as well as T-409 stainless if you need any help just call us.

Mark @ DPPI"
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Old 11-09-2004, 12:02 PM   #6 (permalink)
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Re: 3.5 vs 4.0" downpipe for the 6.0

Sounds like the 3.5 might be the best way to go.

The 4" might make more ultimate power, but changing that in the future is a few pennies compared to what you have to do to make 600 hp and use the 4" in it's entirety. [img]/ubbthreads/images/graemlins/smile.gif[/img]
-T
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Old 11-10-2004, 05:18 AM   #7 (permalink)
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Re: 3.5 vs 4.0" downpipe for the 6.0

So are the newer 04 models equipped with the 3.5" already? This is what I have heard.
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Old 11-10-2004, 08:33 AM   #8 (permalink)
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Re: 3.5 vs 4.0" downpipe for the 6.0

kehale,

Magnaflow is now building 4" turbo back systems for the 6.0. They claim it will fit without modifying the firewall. We have not installed one yet so I can't say for sure that they are correct. Our experience with Magnaflow is that they will not release a product if it doesn't fit as planned.

As far as any power gain? I doubt it. I am sure there will be some additional lowering of Egt's though.

Magnaflow has also released duals for both the 6.0 and 7.3. There tailpipe design, larger muffler, and split behind the muffler are a great improvement over current design and should make installation easier, plus allow for more clearance below the bed. JS.
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Old 11-10-2004, 11:12 AM   #9 (permalink)
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Re: 3.5 vs 4.0" downpipe for the 6.0

[ QUOTE ]
kehale,

Magnaflow is now building 4" turbo back systems for the 6.0. They claim it will fit without modifying the firewall. We have not installed one yet so I can't say for sure that they are correct. Our experience with Magnaflow is that they will not release a product if it doesn't fit as planned.

As far as any power gain? I doubt it. I am sure there will be some additional lowering of Egt's though.

Magnaflow has also released duals for both the 6.0 and 7.3. There tailpipe design, larger muffler, and split behind the muffler are a great improvement over current design and should make installation easier, plus allow for more clearance below the bed. JS.

[/ QUOTE ]

I have the 3.5" down pipe system. I had to pull back the heat shield on the fire wall with a small bracket to keep it from rubbing on the down pipe, which made a nasty vibration/rattling sound. I like my Magnaflow exhaust, but the 4" down pipe would have been a real hassle. Hopefully, they changed the design to fit better.
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Old 11-10-2004, 12:48 PM   #10 (permalink)
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Re: 3.5 vs 4.0" downpipe for the 6.0

I presently have the MBRP 3.5" downpipe. It looks really (I mean REALLY) close to the firewall.

I can't imagine a 4" would fit without bending that flange back a bit.

When I first installed it, it rubbed on the flange when I turned or got on the gas. It was a nasty sound! Thought it was my turbo taking a dump the first time I heard it!
-T
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Old 11-11-2004, 06:11 PM   #11 (permalink)
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Re: 3.5 vs 4.0" downpipe for the 6.0

Anyone????? [img]/ubbthreads/images/graemlins/shrug.gif[/img] My previous post is still unanswered. Anyone know if the stock pipe on a later 04 (03/2004)is 3.5"? And if it is, is there any real gain by swapping it out with an aftermarket one? I am looking at doing exhaust am thinking of skipping the downpipe and just putting in 4" straight through with the exception of my Aeroturbine that I won in a raffle.... [img]/ubbthreads/images/graemlins/grin.gif[/img]

Thanks
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Old 11-11-2004, 09:30 PM   #12 (permalink)
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Re: 3.5 vs 4.0" downpipe for the 6.0

i have late 03. it had 3 inch. my friend bought 04. it had 3 inch, but without all the insulation stuff. my other friend has early 03. same as mine was. my other other friend just got 05. his looks same as 04.

as far as the size of the pipe, bigger is always a plus on a turbine outlet of any turbo. when i fist got my new truck, i was going to build a big pipe right away, didn't have much time to fab anything myself, so i was just going to buy one. but i found that noone built a 4 inch, at least not that i could find. it really didn't take long to build a 4 inch dp in the end. it turned out, as i figured, to have same bends as the old motor, but because new motors' turbo sits more towards driver side, the top is a hair longer.

you would see again by having a bigger dp, may not be in your sop meter, but on your pyrometer.
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Old 11-12-2004, 07:23 AM   #13 (permalink)
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Re: 3.5 vs 4.0" downpipe for the 6.0

So its 3" and not 3.5"............ Thanks thats what I needed to know...
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Old 11-12-2004, 08:33 AM   #14 (permalink)
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Re: 3.5 vs 4.0" downpipe for the 6.0

MightyWhitey,

Nope sorry they are all 3.0 inch down pipes.

Mark @ DPPI
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Old 11-12-2004, 06:27 PM   #15 (permalink)
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Re: 3.5 vs 4.0" downpipe for the 6.0

The 3.5" is more than enough for most applications and should have good performance gains. Banks and Silverline systems both use 3.5" down pipe which change to 4" as soon as space allows.
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