4" downpipe-back exhaust - Ford Powerstroke Diesel Forum

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post #1 of 10 Old 08-13-2008, 05:38 PM Thread Starter
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4" downpipe-back exhaust

I've decided to cut right before the coupler on the downpipe, then run flex until I can get a straight shot with 4" steel pipe to the stack kit. I figure this should be a dramatic increase over the 3.5" pipe with the giant gay flange. I'm shooting for less back pressure, free'd up HP, and maybe possibly like .0001 better mpg I'll post pics tomarrow when I finish

08 CCSB 250 = Spartan, Insanity heads, Stg 1 cam, Elite HPFP, ported rails and 110 inj, H-11 studs, Tow Power compounds, AD 165, wastegate, BOV, CFM adaptor, ccv delete, NXD 6000, SCV

09 LMM Chevy Duramax - CCSB 4x4, SCV w/1058, AD II, EFI Live, EGR BO plate, MBRP 4", Empire tie rods & centerlink-517hp
Both built by me

Cummins is just STROKEN'S mess!!
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post #2 of 10 Old 08-13-2008, 05:39 PM
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think biggest thing youll gain out of it is lower EGTs

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08 Super Cab F250 4x4:
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96 12V Reg. cab Long bed auto, BHAF, CFM, KDP killed, 0 plate, DDP4, HTT 64/71/14, ATS Exh. Manifold. Waiting to install 7" mitre single stack 60# springs 4kGSK.
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post #3 of 10 Old 08-13-2008, 05:41 PM
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Cool. Look forward to the pics.

2008 F-350 6.4 Power Stroke 4X4
CC LWB SRW Auto 3.73's
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post #4 of 10 Old 08-13-2008, 06:10 PM Thread Starter
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I dont know if she'll be purty, but at least she'll be 4 inches in diameter

08 CCSB 250 = Spartan, Insanity heads, Stg 1 cam, Elite HPFP, ported rails and 110 inj, H-11 studs, Tow Power compounds, AD 165, wastegate, BOV, CFM adaptor, ccv delete, NXD 6000, SCV

09 LMM Chevy Duramax - CCSB 4x4, SCV w/1058, AD II, EFI Live, EGR BO plate, MBRP 4", Empire tie rods & centerlink-517hp
Both built by me

Cummins is just STROKEN'S mess!!
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post #5 of 10 Old 08-13-2008, 06:17 PM Thread Starter
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Quote:
Originally Posted by Goolsbymd View Post
think biggest thing youll gain out of it is lower EGTs

That would def be an added bonus

08 CCSB 250 = Spartan, Insanity heads, Stg 1 cam, Elite HPFP, ported rails and 110 inj, H-11 studs, Tow Power compounds, AD 165, wastegate, BOV, CFM adaptor, ccv delete, NXD 6000, SCV

09 LMM Chevy Duramax - CCSB 4x4, SCV w/1058, AD II, EFI Live, EGR BO plate, MBRP 4", Empire tie rods & centerlink-517hp
Both built by me

Cummins is just STROKEN'S mess!!
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post #6 of 10 Old 08-17-2008, 06:36 PM Thread Starter
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Here's some pics guys




















08 CCSB 250 = Spartan, Insanity heads, Stg 1 cam, Elite HPFP, ported rails and 110 inj, H-11 studs, Tow Power compounds, AD 165, wastegate, BOV, CFM adaptor, ccv delete, NXD 6000, SCV

09 LMM Chevy Duramax - CCSB 4x4, SCV w/1058, AD II, EFI Live, EGR BO plate, MBRP 4", Empire tie rods & centerlink-517hp
Both built by me

Cummins is just STROKEN'S mess!!
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post #7 of 10 Old 08-17-2008, 06:41 PM
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sweeeeeeetttttt!!!!!!!!!!!!!!!!!!!

january 2003 6.0 F-350 Lariat 4x4 cc with 08 long bed. recon cab and mirror lenses, torqueshift(reman on 9-03-09) with three disc billet convertor(500 rpm lowered stall speed),mag-hytec deep tranny pan,, 8" fabtech lift w/ 37" iroc super swampers on helos,pro comp ladder bars, custom sct x3 with tunes by eric @ innovative diesel, boost and pyro,edge insight, afe, 4" straight piped, ARP headstuds, banks intercooler & high ram intake. engine mods & maintenance by first coast diesel performance.
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post #8 of 10 Old 08-17-2008, 06:45 PM
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when were you in DC and why didnt you tell me!!!

im 15 minuets from there!!
WTF

96 F-350 XL
CrewCab Long Bed
7.3L Powerstroke
Built Auto Tranny
MBRP Turbo back exhaust system 4"
Straight pipe!
Isspro Gauges.
Boost, Pyro, Tranny temp.
Tint
20% up front 5% in the back


?!?!?what happened to the map logo?!?!?
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post #9 of 10 Old 08-17-2008, 06:48 PM Thread Starter
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Quote:
Originally Posted by george.ratliff View Post
when were you in DC and why didnt you tell me!!!

im 15 minuets from there!!
WTF
Aw man sry bro I left yesterday at like 3 ish and got back home in PA around 2 ish today. It was kind of a spur-of-the-moment thing.

08 CCSB 250 = Spartan, Insanity heads, Stg 1 cam, Elite HPFP, ported rails and 110 inj, H-11 studs, Tow Power compounds, AD 165, wastegate, BOV, CFM adaptor, ccv delete, NXD 6000, SCV

09 LMM Chevy Duramax - CCSB 4x4, SCV w/1058, AD II, EFI Live, EGR BO plate, MBRP 4", Empire tie rods & centerlink-517hp
Both built by me

Cummins is just STROKEN'S mess!!
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post #10 of 10 Old 08-17-2008, 07:48 PM
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looks good have you notice any differance on the egts? I did the same thing but modified a 4" pipe from the coupler to make the bends to the crosmember then went to a 5" straight pipe with 6" tip my egts are 1200 at the max with the sct 1.22 tune and great sound.






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