4" exhaust -vs 5" - Ford Powerstroke Diesel Forum
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post #1 of 21 Old 08-14-2010, 02:06 PM Thread Starter
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4" exhaust -vs 5"

Hey everyone, I looked around before posting this, so if I missed it, then I apologize,... I'm looking at a MBRP 4" turbo-back for my '04, (straight pipe-no kitty/can). I'm torn between the 4" and the 5" though. Other than tonal preference, are there any real pros/cons to either size other than price? Money is tight right now, so it'll be the basic alumized, and I dont want stacks because being a short bed, once I throw my toolbox on, the gooseneck will be too tight for comfort. Any thoughts? I'll buy the chrome "permanent" setup later on, but for now I just want to free up the restrictions, mileage and drop the egt's.
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post #2 of 21 Old 08-14-2010, 02:19 PM
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5 is bigger and it flows more.

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post #3 of 21 Old 08-14-2010, 05:25 PM
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5" is useless, besides putting your wallet on a diet..

I would go the route I did, and grab a 4" MBRP Aluminized Turbo Back Exhaust with a Muffler Delete and Cat Delete for $260 shipped from Adam at FCDP. That's a steal!!

And use that extra money from buying a 5" and put it towards some gauges and an SCT.

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post #4 of 21 Old 08-14-2010, 05:27 PM
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5" is much louder, 4" has better low end, 5" is more $, 5" has lower egt's but for this to be an issue over 4" you would have a high HP setup
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post #5 of 21 Old 08-14-2010, 05:32 PM
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Quote:
Originally Posted by smokersteve View Post
5" is much louder, 4" has better low end, 5" is more $, 5" has lower egt's but for this to be an issue over 4" you would have a high HP setup
I've always been told that the EGT's will be the same no matter 4" or 5" until you push over 600HP. And I've also been told that the 4" is also louder, but that the 5" is deeper and more throatier.

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Loaded with every option...

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post #6 of 21 Old 08-14-2010, 08:34 PM Thread Starter
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Quote:
Originally Posted by smokersteve View Post
5" is much louder, 4" has better low end, 5" is more $, 5" has lower egt's but for this to be an issue over 4" you would have a high HP setup
That's what I was looking for. Sounds like 4" will do it as I am not looking for more than about 450hp as I tow a lot and want it to stay together, (studs are going in right now). I also have to keep the 'Boss' happy on road trips and am looking for all around power, rather than just top end dragging. I appreciate it.

Bryan TAPS Member

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Computer guy now, but former B-1b and '135 Crew Chief
"IYAMYAS" -"Kicked the tires and lit the fires!!!"

'03 F-250 6.0/5R110 4x4 RC/LB, 4" diamond eye exh, SCT X4, EGR missing, ARP studs, new oil cooler... (joint venture between Dad and I)

'02 F-350 CC/LB Flatbed Dually 4x4, 7.3PSD/ZF-6 -WW2, gutted factory exhaust, F.F. Stage 1's, 6637 filter, TS6 w/tunes by Matt and gauges.

'01 f-350 gasser/hand shaker 2wd - Burned to the ground
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post #7 of 21 Old 08-15-2010, 09:58 AM
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I have a 4in MBRP turbo back and i love it. No other diesle i know sounds the same. I wouldnt trade it for any other. Trust me you will be very pleased


*SOLD*1994 Twin Turbo Supra
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post #8 of 21 Old 08-15-2010, 09:59 AM
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Quote:
Originally Posted by SickStroke6.0 View Post
I've always been told that the EGT's will be the same no matter 4" or 5" until you push over 600HP. And I've also been told that the 4" is also louder, but that the 5" is deeper and more throatier.
yes I agree
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post #9 of 21 Old 08-15-2010, 10:37 AM
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I would go with 5 now so you dont need to later jmo

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post #10 of 21 Old 08-15-2010, 12:00 PM
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I've got the 4" dp and 5" back that dumps out the side in front passenger rear tire. Sounds like a beast. I love it! And your probably only talking about $50-75 difference to go go with 5" over 4" in the aluminized. Probably quite a bit more if you went with stainless upgrade though.

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S&B Cold Air intake, ZooDad, 4" Down Pipe, 5" back, SniperTuner, Trans/EGT/PSI A pillar gauges, AirBags, 4.10 Gears w/ Factory LS in rear and TruTrac in front, B&M Trans Pan, Pioneer AVIC-D3 (Bluetooth & back-up camera) w/ Kenwood speakers & 8" Rockford in custom box, Cobra 29LTD Classic CB, 70g in bed fuel tank
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