Muffler to quiet down 6.7 5" straight pipe - Ford Powerstroke Diesel Forum
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post #1 of 21 Old 07-24-2013, 06:19 AM Thread Starter
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Muffler to quiet down 6.7 5" straight pipe

Can anyone suggest a good muffler to still have a very rumble and roar but quiet it down a bit? My straight piped 6.7 is getting a little too loud for my tastes.

2012 F-250 6.7L 4x4 Lariat CCSB, Titan 51gal, BDS 4" kit with Fox Shox, Toyo AT II 35/12.50R20, Ranch Hands front and rear

2007 F-150 King Ranch 4x4 2" Autospring, Bilstein 5100s on all four corners. Nitto A/T 285s.

2005 Chevy Tahoe 5.3l 2WD
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post #2 of 21 Old 07-24-2013, 06:31 AM
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I have aFe Power's muffler set up. It's pretty sweet.
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post #3 of 21 Old 07-24-2013, 09:18 AM
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I do not know what muffler comes with the flo-pro 5" system (it may be their own muffler) but it works very well. It has some sound when on it, but on the highway it is very quiet. You can here the exhaust very low, but no drone at all. You do not have to raise your voice at all to talk in the truck, it is very quiet. I have more noise from the tires by far then I do from the exhaust.
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post #4 of 21 Old 07-24-2013, 06:32 PM
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Aeroturbine FTW
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post #5 of 21 Old 07-24-2013, 06:38 PM
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Try a fte resonator muffler. I got the 17 inch one and it is perfect for my 5 inch straight pipe. My old duramax was fully straight piped and after 5 years of it I wanted something different. This resonator makes it where you cant hardly hear that you have a muffler at all inside the cab and outside noise has a good rumble. When you get on it though it opens up and sounds amazing. I am very happy with my choice. This will also kill every bit of drone you have with your truck no matter what RPM your running at.
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post #6 of 21 Old 07-24-2013, 06:44 PM
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Go with the resonator from FTE. If you want some sound still, go with the 17" unit, it doesn't contain a muffler, if you want a really quiet setup with no drone, go with the 30" resonator, I wish I had gone with a 17" model, now my truck is too darn quiet!

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post #7 of 21 Old 07-27-2013, 08:13 AM Thread Starter
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Why does the 6.7 make that awful whirling sound when you let off throttle?

2012 F-250 6.7L 4x4 Lariat CCSB, Titan 51gal, BDS 4" kit with Fox Shox, Toyo AT II 35/12.50R20, Ranch Hands front and rear

2007 F-150 King Ranch 4x4 2" Autospring, Bilstein 5100s on all four corners. Nitto A/T 285s.

2005 Chevy Tahoe 5.3l 2WD
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post #8 of 21 Old 07-27-2013, 06:03 PM
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Quote:
Originally Posted by wreedPS View Post
Why does the 6.7 make that awful whirling sound when you let off throttle?
It's the waste gate dumping exhaust back pressure.


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post #9 of 21 Old 07-27-2013, 06:13 PM Thread Starter
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Guess that is normal operation?

2012 F-250 6.7L 4x4 Lariat CCSB, Titan 51gal, BDS 4" kit with Fox Shox, Toyo AT II 35/12.50R20, Ranch Hands front and rear

2007 F-150 King Ranch 4x4 2" Autospring, Bilstein 5100s on all four corners. Nitto A/T 285s.

2005 Chevy Tahoe 5.3l 2WD
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post #10 of 21 Old 07-28-2013, 01:47 AM
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Quote:
Originally Posted by wreedPS View Post
Why does the 6.7 make that awful whirling sound when you let off throttle?
you are the only person Ive ever heard NOT like that sound

**ccchhhhheeewwwwww**

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