Down pipes - Ford Powerstroke Diesel Forum
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post #1 of 7 Old 10-23-2012, 08:49 PM Thread Starter
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Down pipes

I have an MBRP 5" SS exhaust on my truck. This system has a 3.5" down pipe that once under the truck expands to a 4" then 5" the rest of the way back. I've looked at MBRP's down pipes but they don't appear to offer a 4" SS down pipe. Does anyone know of a 4" SS down pipe that will work with this system?

2005 F350 Lariat CC LB 4x4
SCT Livewire with EGT Probe, IDP FICM Programmer, 175/30 Renegade Diesel Injectors, ARP Head Studs, EGR Delete, STC Fitting Upgrade, Turbo Oil Feed/Return Line Upgrade, Blue Spring Kit, BullyDog CAI, Accufab Intake, FS2500 Oil Bypass Filter, Coolant Bypass Filter, Mean Green HO Alt., IDP Long Y Pipe, MBRP 5" SS Turbo Back Exhaust.

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post #2 of 7 Old 10-23-2012, 10:55 PM
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also curious, i would like a 4inch dp to 5 inch system, have a 3.5 to 4 right now

2004 CCSB King Ranch-Studded-HG are one way out again-4 inch mbrp-4 foglight mod-8000k hid in all lights-Edge Insight CTS-SCT SF3- Looney Wild/tow/fuel-Riff Raff Boots-Metal CAC Tubes-S&B CAI-CCV mod-07 Front Diff Swap-Rear Captain Chairs-ISSPRO Performax Gauges 3 and growing-2012 Tailgate/camera-2012 Rear View Mirror-Amp Power Steps-2012 Rear Bumper-20 Inch Stock Rims-Auto Enginuity-2012 Power mirrors
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post #3 of 7 Old 10-24-2012, 01:00 AM
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I have a flowmaster 4" turbo back exhaust it has a 4" down pipe, but I'm not sure if they sell just the down pipe.

Cameron
2006 F250 Lariat CCSB
Comp Turbo 64/88 compounds
Warren 285/100
ODAWG ported intake
R&R rods, mahle pistons, stage 2 colt cam
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post #4 of 7 Old 10-24-2012, 01:31 PM
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There really is no need for you to change to a 4" down pipe. It gets really tight in there and you have to work and adjust to get it so it is not hitting anything or rubbing on the up pipe. I rubbed hole in my down pipe and up pipe from contact I couldn't hear. I don't believe you'll see any performance benefit from going 3.5" to 4".
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post #5 of 7 Old 10-24-2012, 02:10 PM Thread Starter
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I don't think you really see much of a perfromance benefit from and exhaust system on these trucks period. Except for cooler EGT's and I've heard that a 4" dp will help more with lower EGT that a 3.5" does. So I'm not hoping for a performance boost but cooler temps and I was curious to see if it produced a different exhaust tone.

2005 F350 Lariat CC LB 4x4
SCT Livewire with EGT Probe, IDP FICM Programmer, 175/30 Renegade Diesel Injectors, ARP Head Studs, EGR Delete, STC Fitting Upgrade, Turbo Oil Feed/Return Line Upgrade, Blue Spring Kit, BullyDog CAI, Accufab Intake, FS2500 Oil Bypass Filter, Coolant Bypass Filter, Mean Green HO Alt., IDP Long Y Pipe, MBRP 5" SS Turbo Back Exhaust.

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post #6 of 7 Old 10-24-2012, 02:11 PM
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Not worth it IMO

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post #7 of 7 Old 10-25-2012, 04:46 AM
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I don't know if there is a 4" dp that will be an exact fit for your MBRP system. All downpipes are basically the same, so you could probably make anyone work. If you have no plans of a drastic turbo upgrade, specifically to a nonVGT, the 3.5" dp will be fine. In fact, VGTs seem to like the slightly smaller downpipe better, meaning they spool a little faster. nonVGTs on the other hand like the 4" dp better. Silverline sells a SS 4" downpipe. i don't know if anyone else sells one separate from a whole system.

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