4 inch or 5 inch - Ford Powerstroke Diesel Forum
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post #1 of 10 Old 09-16-2007, 11:13 AM Thread Starter
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4 inch or 5 inch

I do not have much done to my truck yet and am trying to decide between a 4in or 5in exhaust system? Any help????O ya its a 7.3.....Thanks
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post #2 of 10 Old 09-16-2007, 11:15 AM
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4in is fine. works great.
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post #3 of 10 Old 09-16-2007, 11:24 AM
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From everything I have read, 4" is the way to go, unless you are well into the 500+ RWHP range! Any less than that, and it MAY be less effective. I went with the 4" recently my self for just that reason!

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Do you know what the hardest part of driving a dodge is? Telling your parents that your gay.
Sold the truck to help pay $1.5M in medical bills! Now I have a F150 6cyl that is slower and gets worse mileage
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post #4 of 10 Old 09-16-2007, 11:43 AM Thread Starter
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Ok thanks guys.....Would you suggest straight piped or what?
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post #5 of 10 Old 09-16-2007, 11:48 AM
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Yes definitely straight piped!!

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97 F350 CREW CAB 4x4, 7.3 TURBO DIESEL, DIY INTAKE , TW TUNES
GRAND ROCK POWERFLOW STACK KIT W/5" MITRES
3.55 REARS, 3" DOWNPIPE, FPR SHIMMED WITH GAUGE


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post #6 of 10 Old 09-16-2007, 12:21 PM
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I got a 5" mbrp turbo back on my truck. I love the sound and the looks. I have some buddys with 4"ers and they are pretty good also. So either one will work great.


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post #7 of 10 Old 09-16-2007, 12:27 PM
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def go 4" straight pipe


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post #8 of 10 Old 09-16-2007, 12:53 PM
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I agree with the 4"

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2005 XLT 4x4 Crew Cab 6.0. Torqshift Auto. Arizona Beige.
Mods - 4" FBD Turbo-Back Exhaust with Free-flow Muffler. Power Intake Elbow from Dfuser. Bug Shield. Vent Shades. Aries Step Bars. Custom heavy-duty floor mats. High Idle Mod (great!).
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post #9 of 10 Old 09-16-2007, 12:53 PM
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I hear the straight pipe is the way to go with the 7.3, but the 6.0 is a personal choice. I know that the muff I have you could drop an apple through it without hitting, and mine is the family vehicle, so I kept the Muff, and it does have a throaty sound, but it is still quiet.

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Originally Posted by cchase View Post
Do you know what the hardest part of driving a dodge is? Telling your parents that your gay.
Sold the truck to help pay $1.5M in medical bills! Now I have a F150 6cyl that is slower and gets worse mileage
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post #10 of 10 Old 09-16-2007, 01:01 PM
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It's all about sound and price preference really. A 5" will be just as effective as a 4", but will probably cost more. The turbo causes enough back pressure for the engine, so exhaust size doesn't effect it that much.

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