4" vs 5" exhaust - PowerStrokeNation : Ford Powerstroke Diesel Forum
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post #1 of 12 (permalink) Old 10-19-2009, 06:04 PM Thread Starter
'03 F250SD
 
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4" vs 5" exhaust

New to the site, and to upgrading these. Been stuck using stock 7.3L and 6.0L's at work for years, finally got my own '03 250. Question is if the 5" exhausts are any benefit over 4" for most trucks? I don't plan on racing, sledpulling etc, probably never more than 200HP over stock even down the road. Mine was a repo and the previous exhaust stacks are mysteriously gone.
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post #2 of 12 (permalink) Old 10-19-2009, 06:12 PM
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Re: 4" vs 5" exhaust

4" will give you all the flow you need, 5" is mainly for looks and sound. If you want it loud though, go with 5". Let me know if theres anything I can help with.
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post #3 of 12 (permalink) Old 10-19-2009, 06:15 PM
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Re: 4" vs 5" exhaust

Only real difference that I know of will be sound. I would think the EGT's will be slightly lower with 5" but there are too many variables to actually compare this.

MBRP Aluminized or stainless 4" will probably be the best bang for your buck other than simply straight piping the factory exhaust (if any is left in your case)

2005 F350 Crew Cab Long bed
6.0L / Auto 4x4
SCT X3 5" Magnaflow
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post #4 of 12 (permalink) Old 10-19-2009, 06:47 PM Thread Starter
'03 F250SD
 
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Re: 4" vs 5" exhaust

yeah mine stops at the back of the cab where it went up into the bed, so I'm gonna just get a full turbo back system. Around $100 bucks or so diff between sizes, and I'm really debating whether a worthwhile drop in EGT is possible? (cats gonna go too.)
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post #5 of 12 (permalink) Old 10-19-2009, 08:57 PM
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Re: 4" vs 5" exhaust

I have a bullydog 4" from the turbo back and it empties into a 6" tip. Ive had is straight piped for about a year or so and LOVE it!! sounds mean as hell!

06 F250 Lariat CC SB FX4 6.0, EGR Delete by FCDP , 58v FICM by Quick Tricks, Autometer Gauges (Boost, Pyrometer, Trans. Temp), SCT X3 W/ IDT, 4" TB Straight Pipe, S&B CAI, ZOODAD, Retro-Solutions HID Kit (4300k), CCV Mod, Coolant Filter

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post #6 of 12 (permalink) Old 10-19-2009, 09:17 PM
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Re: 4" vs 5" exhaust

ive got 5" with a 4" dp.... sounds really deep and not obnoxiously loud either.. no real diffrence in performance between 4' and 5' other than looks and sound.... the sound of a 5" imo is defin better than 4".. thats just my $0.02...

2001 F-250 7.3L PSD 4x4, S&B CAI,Zoodad Mod,Foil Delete,Van Turbo,WW,4" DP w 5" Exhaust,CCV,HPOX,DP Tuner(high idle,lope,60hp,80hp,120hp,140hp)ITP Overboost Anhilator,Autometer PYRO & Boost, 2" Rear Lift w 2.5" Skyjacker Leveling Kit, Procomp ES9000 Shocks..
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post #7 of 12 (permalink) Old 10-19-2009, 10:51 PM
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Re: 4" vs 5" exhaust

4" will work fine, and I considered it as well but liked the look and sound of the 5". just wish I would have went with a 6" tip.

'07 F350 3" lvl, fndrs trmd, 37" M16's
Ultra lites ECT,EGT,EOT Oil and top fuel billet caps
banjo bolts drilled cautiously, ccv, zoodad mods Dieselsite coolant filter
SCT SF3 can tunes

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post #8 of 12 (permalink) Old 10-19-2009, 11:25 PM Thread Starter
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Re: 4" vs 5" exhaust

For the small price diff I think the 5" is what I'll get. How long do the Aluminized last? I'm guessing the aftermarket doesn't use as corrosion or heat resistant piping as O.E.
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post #9 of 12 (permalink) Old 10-19-2009, 11:57 PM
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Re: 4" vs 5" exhaust

I've had mine come 2yrs this Christmas. No rust problems yet.

'07 F350 3" lvl, fndrs trmd, 37" M16's
Ultra lites ECT,EGT,EOT Oil and top fuel billet caps
banjo bolts drilled cautiously, ccv, zoodad mods Dieselsite coolant filter
SCT SF3 can tunes

Mike's Diesel Performance
KT Performance
DieselPowerProducts.com
Dieselsite
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post #10 of 12 (permalink) Old 10-20-2009, 12:02 AM Thread Starter
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Re: 4" vs 5" exhaust

sounds like long enough for me.
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