4" or 5" exhaust - Ford Powerstroke Diesel Forum
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post #1 of 25 Old 01-31-2013, 09:25 PM Thread Starter
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4" or 5" exhaust

I have a bone stock f450. Just ordered my mini maxx. Doing egr delete and Dpf. Going to keep stock air intake.

Stick with a 4"? What's benefit of a 5"?

Thanks
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post #2 of 25 Old 01-31-2013, 09:59 PM
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4" and 5" are same benefit in my opinion. The downpipe is going to be a 4", the stock is a bent to all hell pipe 3.5". The 5" pipe sounds better in my opinion. Browse YouTube for the sounds differences, but that is about the only difference since most likely you will have a 4" downpipe.

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post #3 of 25 Old 01-31-2013, 10:09 PM
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Quote:
Originally Posted by Redz284u View Post
I have a bone stock f450. Just ordered my mini maxx. Doing egr delete and Dpf. Going to keep stock air intake.

Stick with a 4"? What's benefit of a 5"?

Thanks
5" will have a deeper tone. No performance difference at all between the 2, untill you get into some serious HP applications.

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post #4 of 25 Old 02-01-2013, 03:01 AM
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5" is what I have, My buddy has 4" and he is now getting 5" after hearing mine, it wasnot thathard to install , might need a hand to help, WD40 is your friend and a few jack stands to set everything even when it comes time to make everything tight. having a 4" DP and 4" exhaust will put the end of your restriction at the tip of your exhaust, haveing a 4" DPand 5" out will put the end of your restriction at the end of the DP, how ever small this restriction is the less the better on turbos


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post #5 of 25 Old 02-01-2013, 03:32 AM
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i have 5" because my dad talked me into it. I love the sound. Nice tone, not a drone like other exhausts i have heard.

My sound levels out at around 65 to 70 and all you hear is motor at that point. Really nice.

Go with the 5" you won't regret it,


08 JOB 1 F-250 Lariat Crew Cab, S&B INTAKE, H&S Blk MAXX, 5" Flo PRO, EGR Delete, Air Dog 165, Upgraded Bellows, MBRP Intercooler pipe, 4" Down pipe, Tial Wastegate, OUO T bars, ARP studs, Bestop pwrbrds

***Legal Disclaimer: Anything I say about my vehicle on this website(Powerstroke.org), pertaining to modifications, is only to gain acceptance from my peers, and does not actually represent anything actually existing on my truck, and thus, cannot be held against me in any issues.
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post #6 of 25 Old 02-01-2013, 04:38 AM
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4" or 5" exhaust

5" to 6" tip is beat IMO. It's what I'm running and looks/performance best from what I have experienced.

I had a 4" on my 6.0 and it just looked too small. Difference from a 4-5...eh who knows but I could tell.


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*NEW:
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NL Fab:
---Stage 1 Intake
---EGR shmock off plates
---Flo Pro Exhaust (5" to 6" tip)
---SCT with GH tunes
---Waiting for first Fuel Filter change to install:
---------CCV Mod
---------CTS2 monitor with EGT Probe
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H&S
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post #7 of 25 Old 02-01-2013, 04:48 AM
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Go for the 5", i wish i did. Sounds deeper and has more tone.


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post #8 of 25 Old 02-01-2013, 05:09 AM
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since i will assume you are towing with your 450 ill toss in my opinion as well. i have a 350 and tow constantly and very heavy( large equipment). i bought a 5 inch flo pro turbo back with muffler and a 6 inch tip. once i saw it i was affraid of the noise i would hear while towing. boy did i a good surprise, outside i can hear the hair dryer sound these trucks have but inside i hear nothing different than before even whil towing and with the windows down. My egts did drop a little, not really sure how much but i am sure they are down a touch. the big benefit for me was the from a stand still bottom end power. i cant prove it and i have no numbers to back it up with but my seat of the pants dyno says that the truck moves the dozer or the hoe from a stand still much easier than before. i seem to use less go pedal to get moveing than before. to date i have no negatives with this exhaust. i also have the firestone air bags and the b&w turn over ball and this system didnt hit any of it and somehow i was able to remove the spacers i had to put in for the stock exhaust to fit with the bw.
hope this helps
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post #9 of 25 Old 02-01-2013, 05:10 AM
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Do it right the first time, u will ge the 4 inch and then want the 5 inch...that's where I'm at I have a 4 inch and I want a 5 inch...the looks alone are enough for me .....there's a little difference in sound but not a lot
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post #10 of 25 Old 02-01-2013, 06:21 AM Thread Starter
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SOLD to the lady in 5" exhaust. Thanks all. I really appreciate every ones help.
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