Straight-pipe vs. muffler - Ford Powerstroke Diesel Forum
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post #1 of 17 Old 11-28-2012, 07:35 PM Thread Starter
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Straight-pipe vs. muffler

I am looking at deleting and tunning my 2012 6.7. I am planning to go with EGR/DPF delete H&S MM. decided to go with this tuner over spartan after browsing the forum. I also plan to go with the S&B intake. What are the opinions on exhaust? I spoke with a guy who ran this same tuner and intake with a 5" Flo-Pro exhaust with muffler. he said he originally straight-piped and then switched after a week. I cant find any video clips of performance exhaust with muffler. I like the sound of the straight-pipe but havent heard it in person and just wonder if it would be too much cab noise (mostly when towing). Any suggestions or clips of good performance mufflers on 6.7s? i have found plenty of straight-piped. thanks
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post #2 of 17 Old 11-28-2012, 07:44 PM
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I'll have my 5" w/o a muffler in a week or two. Ill let you know.


*SOLD*2008 F250 6.4: H&S Mini w/ Bully dog mount, Flo-Pro DPF/CAT delete, AFE stage 2, Viper 5901 Remote start.
2012 F250 6.7: S&B CAI, H&S Mini Maxx, 5" MBRP straight exhaust, Firestone airbags.
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post #3 of 17 Old 11-28-2012, 10:05 PM
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i got 5in straight piped on my 6.7 i like the way it sounds on the lower rpms cool turbo sounds but honestly its too loud on the higher rpms, considerably louder than my 6.4 straight piped 4in. i may end up with some kind of muffler i wonder what one of those aeroturbine mufflers would sound like. ill also add i had an 04 lb7 duramax 5in straight piped an id say this 6.7 is just as loud, comparing at high rpm. hope that helps

Chris
2012 f350 crew cab dually lariat
h&s tuner w/dpf delete
5in exhaust w/aeroturbine muffler

2008 f250 reg cab short bed
Livewire w/gearhead tunes
Dual exhaust
Already fast as my 6.0 :/

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Fass fuel pump w/sump
4in mbrp exhaust
s&b intake
ec-1 coolant w/coolant filter
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powermax turbo w/ billet wheel
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post #4 of 17 Old 11-29-2012, 05:56 AM
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From what I hear they will all be pretty loud. The muffler takes out the higher frequencies and gives it more of a tone. The turbo already acts like a muffler. My opinion would buy a 5" kit with a muffler, then you can run a straight pipe. If its too loud then install the muffler since it just clamps in. If all else fails then maybe look at getting a resonator installed. I don't think it would be annoyingly loud unless your flooring it everywhere. It's just my poor opinion. I know YouTube isn't much help either, 98% of the videos on there are trucks revving, blowing black smoke and flooring it everywhere. I'd like to see someone with a good camera actually make a legit video.
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post #5 of 17 Old 11-29-2012, 02:14 PM
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Installed my 4" flo pro last night with H&S tuner and I was worried about the noise level as well. After install I was pleasantly suprised with with sound. Has a low rumble at idle. Under normal driving conditions the cab noise is damn near stock in my opinion.

At WOT it roars pretty good but that is to be expected.
Havent towed with it yet so cant help you there.

My wife didnt even notice it at 80 today on the highway. Im happy with it.
Hope this helps.
Brian
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post #6 of 17 Old 11-29-2012, 02:49 PM
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I have a 5" w/ the muffler to keep it a little more quite while towing. It has a really deep rumble to it. I am very happy with how it turned out.

Matt
2011 F350 6.7L CC/LB SRW 4x4 King Ranch White Tri Coat
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post #7 of 17 Old 11-30-2012, 02:20 AM
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I'll second the muffler'd exhaust. There is still sound when you want it, but the levels during regular driving aren't much louder than they used to be.
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post #8 of 17 Old 11-30-2012, 08:21 AM
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This is some throttle shots I did. I'm completely satisfied with my exhaust. Not too loud, but roars when you mash motor. Like post from above, hiway speeds are not even noticable over stock.

94% of all Dodge Cummins trucks from1992 through 2012 are still on the road today..... The other 6% made it home.....

2012 F250 Lariat FX4
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If it still runs when you delete it, you don't need it!
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post #9 of 17 Old 11-30-2012, 08:57 AM
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My question is are there any noticeable differences in performance?


Sent from my iPhone using AutoGuide.com Free App

New Truck
2012 Lariat FX4 Off Road, Tuxedo black, Custom paint to match grille, paint to match halo projector headlights, S&B intake, Amp Steps, RBP 94R black with chrome insert 20X9 wheels, 35 Nitto Trail grapplers

The Toy
2001 4x4 off-road extended cab, DP tuner, 4 inch turbo back, S&B filter, smoked projector headlights, Ranch hand fron & rear replacements, 18 inch fuel wheels, nitto trail grapplers.


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post #10 of 17 Old 11-30-2012, 08:58 AM
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Quote:
Originally Posted by Scubamax View Post
F250 6.7 scorpion exhaust - YouTube

This is some throttle shots I did. I'm completely satisfied with my exhaust. Not too loud, but roars when you mash motor. Like post from above, hiway speeds are not even noticable over stock.
Great video may have made my decision of of it alone.


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New Truck
2012 Lariat FX4 Off Road, Tuxedo black, Custom paint to match grille, paint to match halo projector headlights, S&B intake, Amp Steps, RBP 94R black with chrome insert 20X9 wheels, 35 Nitto Trail grapplers

The Toy
2001 4x4 off-road extended cab, DP tuner, 4 inch turbo back, S&B filter, smoked projector headlights, Ranch hand fron & rear replacements, 18 inch fuel wheels, nitto trail grapplers.


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