straight pipe ?? - Ford Powerstroke Diesel Forum
6.0L Performance Parts Discussion What has or has not worked for you?

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post #1 of 7 Old 11-21-2012, 05:16 PM Thread Starter Fanatic
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straight pipe ??

i have a bone stock '04 f350 6.0 and was wondering if i remove that cat and muffler would that help performance and get better mileage?
does it screw sensors up? make the turbo loud?
totally new to this diesel thing any help would be appreciated.
also if it makes the turbo loud would love to piss off the neighbors.
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post #2 of 7 Old 11-21-2012, 05:31 PM
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There's TONS of threads about this. Letting the motor breathe easier is the first step, always.

2000 F-350 Lariat Super Duty, Dually, CCLB, 7.3L
4R100, 2wd
330,000 + miles
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post #3 of 7 Old 11-22-2012, 09:15 AM
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You don't gain much in hp/tq #'s with exhaust on these trucks. You will see a drop in egt though.

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 #4 of 7 Old 11-22-2012, 03:10 PM
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You'll love the sound if you're wanting to hear the turbo. It'll whistle nicely. Stock tubing with no cat or muffler has a nice growl under throttle. Won't mess up a thing!

2005 F-250 Lariat FX4 CC SB
Sinister EGR Delete
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post #5 of 7 Old 11-22-2012, 03:47 PM
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There are no sensors (O2) like in a gas vehicle. like said before, you will hear a little more turbo, but more exhaust note under heavy foot.

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post #6 of 7 Old 11-22-2012, 04:50 PM
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im running stock downpipe, 4 inch straight exhaust and 5 inch tip....what a glorious sound...

-Tyler- -Navistar Technician-
2004 F250 CCSB FX4 6.0 - XDP EGR delete, BPD Oil Cooler Relocation, SCT Livewire TS, 315/75/16 Falken Wildpeak A/T's, Rough Country 4in, stock DP with 4in straight pipe.
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post #7 of 7 Old 11-23-2012, 01:00 PM
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I agree with everyone on the sound, I am 4" from the turbo all the way straight piped with a long 6" tip and I love the sound of it especially under normal driving inputs, the turbo whines at a modest high pitch. When you throttle away from a stop it does have a blowing sound to it and with a heavy pedal it definetly has a powerful growl.
As far as performance goes: when going with a larger pipe at the turbo the very bottom end does suffer a bit until turbo spools up and milage or hp gains are neither here or there but yes on lower exhaust temps and that is always-always a good thing for everything from exhaust valves and guides to the manifolds and the turbo so yes I feel it's a well worth it investment of time and money.

2006 F250 LARIAT CCSB 4X4
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X4 PHP 65 HP Custom Tow Tune
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BPD Waterpump, BPD way of thinking
Fass-125 to a Adjustable Pressure Reg.
Turbo-back SS 4" pipe, Corsa Muffler -7" Tip
6.4 starter, DC Power 270 amp alt
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