Running no muffler - Ford Powerstroke Diesel Forum
6.0L Performance Parts Discussion What has or has not worked for you?

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post #1 of 15 Old 12-19-2012, 05:43 PM Thread Starter
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Running no muffler

So i was thinking about just removing the muffler leaving the cat on. Will this help my truck at all or does the turbo need back pressure? Some guys say your mpg will go down but its probably them just laying in to the truck for the sound so what do you guys think?
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post #2 of 15 Old 12-19-2012, 05:46 PM
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The turbo supply's back pressure on a diesels the faster u can get it out the better

Chris
1999 F-350 Crew Cab Long Bed 4x4 370,XXX
4inch mbrp turbo back straight pipe
DIY intake
Superchip tuner for now
6 inch RC lift
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post #3 of 15 Old 12-20-2012, 06:17 AM
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I've heard that too--that running a straight pipe will reduce MPGs. Can anyone verify if that's true and why?

ROB
2006 F350 Lariat CC LB FX4 Dually Auto 4.10

MODS:
Edge Insight CTS
SCT X4 Quicktricks Custom Tunes
KC Stage 2
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IPR High Flow Coolant Filter
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post #4 of 15 Old 12-20-2012, 06:24 AM Thread Starter
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I heard it was that theres no back pressure
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post #5 of 15 Old 12-20-2012, 07:06 AM
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That is all false, a straight pipe on a turbo is a good thing. The turbo itself provides all the back pressure the motor needs. A straight pipe will not hurt mpgs, if anything it should help some because the turbo can move air more efficiently.

My RAZR made me send this...


-Brian

2003 F-250 6.0L - Lariat King Ranch
-300k+ miles and still strong
Current Mods
-6.5" Pro-Comp lift
-Edge CTS
-SCT X3 (Tuned by Vivian )
-4" Turbo Back Silverline Exhaust, 5"tip
-Blue Spring Mod
-Sinister Coolant Filter
-Oil Cooler
-Sinister EGR Delete
-OEM Cab Lights
Wants/Soon
-ARP Studs
-MTW Stage 1 or Hybrid
-6.4 Banjo Bolts?
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post #6 of 15 Old 12-20-2012, 11:26 AM
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The muffler isn't that restrictive compared to the cat, so all you're going to gain is some upset neighbors.

2012 F-150 XLT Ecoboost SuperCrew 6.5' 4x4
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post #7 of 15 Old 12-20-2012, 11:30 AM
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Quote:
Originally Posted by bwmtnbiker View Post
That is all false, a straight pipe on a turbo is a good thing. The turbo itself provides all the back pressure the motor needs. A straight pipe will not hurt mpgs, if anything it should help some because the turbo can move air more efficiently.

My RAZR made me send this...
This is the conclusion that I came to. I dont know if my mpg's got better when I swapped the exhaust since I was also on a new motor.

KCCO
Paul Devereux
2005 FX4 Lariat Dark Shadow Gray
AirRaid Filter, 6 inch Pro Comp Lift. 17 inch Mikey Thompsons with 35 inch Nittos, sinister coolant filter, MBRP 4" straight pipe, 6K HID, Zoodad, SCT with tunes from Vivian (Looney and Looney fuel) and Tony, dashboss with EGT and FP, 08' tail lights, blue spring, lowes CCV mod, 03' turbo

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post #8 of 15 Old 12-20-2012, 11:42 AM
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When i put my 4in turbo back magnaflow system on W/O cat but have muffler which is strait thru I gained better than a 1 mpg.

Chris

2003 F350 DRW
New 6.0 Jasper engine with studs
Edge CTS
SCT 3015
Cat ELC
Sinister Coolant Filter
4in Magnaflow turbo back (no cat)
High Idle Mod
100gal aux. fuel tank (electric pump)

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post #9 of 15 Old 12-20-2012, 12:05 PM
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Ask yourself this;

1. What are my mpg's currently?
2. If they dropped 1-2 mpg's, would I lose sleep at night?
3. What if I did gain mpg's?

Just try it. If you don't like the performance or the sound, put it back on. Just my

Shack

2016 F-350 CC Dually

2005 F250 CC FX4.SOLD
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post #10 of 15 Old 12-20-2012, 01:38 PM
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no mpg loss and just removing the muffler won't be real loud at all my favorite sounding exhaust is muffler and cat delete on factory exhaust you still have a resonator pre cat

White Early 2004 F250 Harley

Adrenaline hpop, Aeromotive, ARP, BPD, BTS, Carli, Fox, Fuelab, GH/TSD/Wildman, Holders 225/75, KC Turbo, PMF, S&B, Mishimoto rad/ic, 08 axle swap

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