Straight-pipe vs. muffler - Ford Powerstroke Diesel Forum
6.7 Performance Parts Discussion 6.7 Performance Parts Discussion

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Old 11-28-2012, 07:35 PM
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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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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.
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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
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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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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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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.
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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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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.
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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
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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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