down pipe or not - Ford Powerstroke Diesel Forum
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post #1 of 22 Old 01-29-2014, 05:15 AM Thread Starter
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down pipe or not

Excuse my ignorance, im very new to diesels. Does my 2003 7.3 have the restrictive down pipe. Im going to a 4 inch exhaust, seems like a waste to install unless i replace down pipe too. I thought the earlier 7.3's had the issues with the down pipe.
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post #2 of 22 Old 01-29-2014, 06:47 AM
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OH, it's a Big difference! Here's my '02 stock pipe

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post #3 of 22 Old 01-29-2014, 08:45 AM Thread Starter
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solves that issue, i will be buying a down pipe too.

thanks for the pic
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post #4 of 22 Old 01-29-2014, 10:31 AM
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Get the downpipe if your doing an exhaust, but the Superdutys do not suffer from the squashed pipe the OBS trucks do...


01 F-250 SC PSD,320k,16 Isspro Gauges, AFE-2,CCV Mod,IAH delete,map reg,Modded H2e, 6.0 IC, 230/100 from P.I.S, Studs, 910 springs, Forged rods, Water injection,Hydra chip-No Limit/Gearhead tuning, Swamps HVHF IDM, MBRP 4" dual's, Aero, 6" tip's, 4" Revtek lift, 37/12.5/16.5 MT's
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post #5 of 22 Old 01-29-2014, 11:48 AM Thread Starter
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does a turbo back exhaust system include the downpipe?
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post #6 of 22 Old 01-29-2014, 12:11 PM
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yep, turbo back is what you want.


the obs downpipes were horrible....

99.5 f250 7.3 4x4 260k FF 160/30, PHP Hydra, S&B CAI, 4" Exhaust, RR Billet Wheel, Autometer Gauges, Transgo, Non-Ebpv Pedestal, High Flow Outlet, 08 Tow Mirrors.

Dad-2000 7.3 4x4 110k miles, Autometer Gauges, Superchips 1705, 6637, 4" Exhaust, BD Billet Wheel, TruCool Max
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post #7 of 22 Old 01-30-2014, 04:23 AM
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Another stupid noob question. I don't want a loud exhaust on my truck, I like the quiet stock one and want to keep it like that. Does it make sense to just replace the downpipe with a 4" one, and keep the rest stock?

2002 F-250 199K crew cab 2x2, auto, PHP Hydra, Isspro, and intake.
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post #8 of 22 Old 01-30-2014, 05:49 AM
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I don't think you can do that unless you use a reducer or something. Just get a 4" with a muffler and it shouldn't be unbearably loud.

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post #9 of 22 Old 01-30-2014, 06:24 AM Thread Starter
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Im the same way, want performance but not something too loud. My 4" turbo back will have a muffler. Stock muffler has big hole so I may not notice a increase sound.
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post #10 of 22 Old 01-30-2014, 07:03 AM
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My wife was concerned with that when we added a 4" exhaust to her Excursion... The Exhaust note changed, but nothing noticable at the drivers seat...

However I got some dirty looks when we put the AFE-2 intake in... That was not a fun drive back from Elite Diesel all those years ago... LOL

01 F-250 SC PSD,320k,16 Isspro Gauges, AFE-2,CCV Mod,IAH delete,map reg,Modded H2e, 6.0 IC, 230/100 from P.I.S, Studs, 910 springs, Forged rods, Water injection,Hydra chip-No Limit/Gearhead tuning, Swamps HVHF IDM, MBRP 4" dual's, Aero, 6" tip's, 4" Revtek lift, 37/12.5/16.5 MT's
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