another dumb exhaust question - Ford Powerstroke Diesel Forum
6.0L Performance Parts Discussion What has or has not worked for you?

 
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post #1 of 9 Old 11-01-2007, 05:32 PM Thread Starter
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another dumb exhaust question

I had a buddy of mine tell me that if you run a 5" straight pipe on an all stock truck(2007 f-250 6.0L psd) that it would run like crap. Is this true I was lead to believe that after the turbo the bigger the better, that you wanted zero back presure.

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 9 Old 11-01-2007, 05:38 PM
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Stock 6.0's do need some backpressure. Some Straight piped stock 6.0s will set a CEL some wont.

Email: Dave@powerstroke.org
2011 F150 Ecoboost Crew cab lariat. Custom tunes from KEM and 5Star, and Unleashed
2012 F150 Crew Cab Ecoboost stock for now-Totaled March 12 2015
2006 F250 ECSB Lariat 4x4

Leveling kit, 315/70/17 Kelly TSRs on Method race wheels
ARP studs and OEM gaskets done by Renegade Diesel
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Flowmaster/MBRP Hybrid Exhaust
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Bulletproof diesel FICM EGR Delete, Oil Cooler and Water Pump, and Light bar.
Dually LED lights from Stealth Automotive/Xpedition Outfitters
No Limit Fab 6.0 Cold Air Intake
http://www.bulletproofdiesel.com/default.asp
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post #3 of 9 Old 11-01-2007, 05:41 PM Thread Starter
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what is a CEL

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 #4 of 9 Old 11-01-2007, 05:43 PM
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CEL is a check engine light. sorry about that

Email: Dave@powerstroke.org
2011 F150 Ecoboost Crew cab lariat. Custom tunes from KEM and 5Star, and Unleashed
2012 F150 Crew Cab Ecoboost stock for now-Totaled March 12 2015
2006 F250 ECSB Lariat 4x4

Leveling kit, 315/70/17 Kelly TSRs on Method race wheels
ARP studs and OEM gaskets done by Renegade Diesel
ECM and Atlas 40 FICM tuned by Bill at PHP SCT tunes by Truck Source Diesel. Gearhead, Innovative, Wildman and Tyrant diesel
Flowmaster/MBRP Hybrid Exhaust
Edge Insight CTS
Coolant filter
Bulletproof diesel FICM EGR Delete, Oil Cooler and Water Pump, and Light bar.
Dually LED lights from Stealth Automotive/Xpedition Outfitters
No Limit Fab 6.0 Cold Air Intake
http://www.bulletproofdiesel.com/default.asp
http://nolimitfabrication.com/
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post #5 of 9 Old 11-01-2007, 05:46 PM Thread Starter
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oh right i should of caught that. Man i really want that 5" from mbrp but im not doing any mods for awhile( tight Budget).

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 #6 of 9 Old 11-01-2007, 05:50 PM
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From what i've heard and read, a 5" will only benifit if your truck is makin' over 500hp. Otherwise, a stock truck won't run quite as well as a 4" exhaust.

HI.....I'm Kyle
RIP: 1996 F-250 X-Cab Long Bed
Now: 2006 Ram 2500 CC SB SLT 6 Speed
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post #7 of 9 Old 11-01-2007, 05:58 PM Thread Starter
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yea but if your going to straight pipe it you think 4" or 5" would be pretty close to the same

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 9 Old 11-01-2007, 07:37 PM
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3.5 to 4 in. is approx. a 15% increase in flow. So 4 to 5 in. would be around 30% increase in flow if my math is right? A stock motor does not need a 30% increase in flow. 4 in. is more than enough. Just get a 6 inch tip that'll fit a 4 inch pipe man.

"That which does not kill us makes us stronger"
"The only easy day was yesterday"

2006 F-250 SC 4x2 6.0
Isspro Pyro
Zoodad
High Idle Mod
Diamondeye 4" Stainless Turbo-back Exhaust
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post #9 of 9 Old 11-01-2007, 07:42 PM
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you could jst straight pipe it with stock tubing
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