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

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post #1 of 14 Old 10-30-2007, 06:29 PM Thread Starter
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5" pipe

how much power is really needed to flow the air that requires a 5" pipe. Im just trying to see if its over kill for what im trying to do.


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2007 F-250 lariat Krew cab [psd]
4" downpipe into 5" straight pipe w/6" tip
AFE stage 2 type si intake
Predetors airfury(zoodad mod)
SCT Xcal3 w/DJ's custom tunes
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post #2 of 14 Old 10-30-2007, 06:32 PM
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You probly dont need a 5 inch if your just getting a chip and other minor mods, fill out your signature and you could get some better advice.

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2007 F-250 PSD FX4 crew cab shortbox king ranch
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post #3 of 14 Old 10-30-2007, 06:56 PM
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I agree, 4' will do just fine.

99 F350 4x4 dually
7.3 w/K&N af
4" exh into 6" Aussies stacks
4"lift &35" tires
CC mod HP crossover line
Beans stage II 120hp injectors
D66 turbo
ITP regulated return
reburn on TS= 25,high idle,60,100,120,140hp
updated ecm (2000 model)
Dyno#'s 360hp and 965 ft lbs trq
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post #4 of 14 Old 10-30-2007, 07:04 PM
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You'll NEVER require a 5" pipe... people just get it for the sound!

2001 F250
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post #5 of 14 Old 10-30-2007, 07:58 PM
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I had a 5" on my 2000 f350 and loved the sound. Looked badass with the 6" tip! I still have'nt made up my mind on my new truck. May go with 4" because they are cheaper.

2006 F-250 Lariat, SRW, 6.0L PSD, 4x4, Crew Cab, Long Bed, Auto, 52K Miles

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post #6 of 14 Old 10-30-2007, 08:46 PM
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A 4" will flow more air than you will ever need and then some but the 5" just sounds awsome.

(SOLD) 2006 F250 Regular Cab 4X4, Elite stg 3 injectors, Elite VGT-SS turbo, 5" MBRP, AFE stage 2, Accufab, Sperco intercooler, NOS with help from DJ, Suncoast tranny and SCT from Elite. Best 1/8th is 7.09 @ 97with a 1.53 60ft, Best 1/4 mile is 11.51 @117. 790rwhp and 1286 torque at Suncoast dyno day 2-2-08
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post #7 of 14 Old 10-30-2007, 08:53 PM Thread Starter
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i Have seen your vid on the elite site. those are some good runs. what size are you using with all that power.


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2007 F-250 lariat Krew cab [psd]
4" downpipe into 5" straight pipe w/6" tip
AFE stage 2 type si intake
Predetors airfury(zoodad mod)
SCT Xcal3 w/DJ's custom tunes
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post #8 of 14 Old 10-30-2007, 09:07 PM Thread Starter
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The mbrp 4" off road is the one that i want because it has the cat delete pipe. I found out that it has only a 3.5" downpipe. Why is that? Is that how most 4" systems are? you think it would a 4" down pipe. If anybody has info on this please let me know im bambozled haha. thanks.


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2007 F-250 lariat Krew cab [psd]
4" downpipe into 5" straight pipe w/6" tip
AFE stage 2 type si intake
Predetors airfury(zoodad mod)
SCT Xcal3 w/DJ's custom tunes
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post #9 of 14 Old 10-31-2007, 06:11 AM
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Not all systems have that.I have a Bully dog 4" dual from turbo back and sounded real good. It was pricey though. But the down pipe is 4".

99 F350 4x4 dually
7.3 w/K&N af
4" exh into 6" Aussies stacks
4"lift &35" tires
CC mod HP crossover line
Beans stage II 120hp injectors
D66 turbo
ITP regulated return
reburn on TS= 25,high idle,60,100,120,140hp
updated ecm (2000 model)
Dyno#'s 360hp and 965 ft lbs trq
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post #10 of 14 Old 10-31-2007, 06:37 AM
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On alot of systems you will find 3.5 inch is way easer to install and very little difference in power then 4 inch down pipe but if your paying to have it installed go with 4inch down pipe
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