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Dual Exhaust Tip Size and Sound - 4"x18" versus 3"x22"

 
Old 02-11-2019, 06:18 PM
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Default Dual Exhaust Tip Size and Sound - 4"x18" versus 3"x22"

Got a question about exhaust tip size and length.

5.0L with dual exhaust from a MagnaFlow muffler with dual 4" x 18" tips out the rear

It has a little bit of resonance between 1600 and 2000 rpm, really thinking it's the diameter of the tips since I've had two different mufflers on there with the same resonance.

Would a switch to dual 3" x 22" tips possibly cure the resonance? Some say tips make no difference to sound, but others claim the tips act like megaphones. I'm afraid I went too big with the 4" x 18" dual tips.

More specifics:
2014 F-150 Supercrew 4x4, 157" long wheel base (6.5 ft box), 5.0L V8
From the clamp/flange just past the cat, it jumps up to 3" pipe
then into a 3" Vibrant Ultra Quiet Resonator (went ahead and replaced the old rusty stock resonator)
then into a MagnaFlow 12588 muffler (single 3" in, dual 2.5" out)
2.5" dual pipe from the muffler to the rear
dual 4" dia x 18" long tips

I did have a Borla 40349 muffler on there, and it was just far too loud in the cab, I swapped it out for the MagnaFlow 12588 with it's longer length and the volume is much better, but the annoying resonance is still present.
The annoying resonance is between 1600 rpm and 2000 rpm and was present with both the Borla AND the MagnFlow on there, it's just quieter now with the MagnaFlow but still present and still annoying. Is it the tips? I really like the look of the dual 4" tips but the resonance is a more important issue than looks....just wished I knew if dropping down to 3"x22" tips would cure it, or if I should be looking at adding a second resonator instead; either option is about $100 and I can't say I've ever seen a truck with two resonators in line, but maybe with my longer wheel base and the long straight run between the resonator and the muffler is the issue?
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Old 02-13-2019, 10:32 AM
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Here's a video from the driver's seat:

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Old 02-13-2019, 10:40 AM
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Originally Posted by artcarney_agr View Post
Here's a video from the driver's seat:

https://youtu.be/2p5tTsIEmLI
That helps him how ?
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Old 02-13-2019, 10:49 AM
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Originally Posted by techrep View Post
That helps him how ?

Huh?
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Old 02-13-2019, 10:51 AM
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Originally Posted by artcarney_agr View Post
Huh?
Sorry wrong spot.. my bad
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Old 02-13-2019, 04:39 PM
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I have a single in, dual out system on my 3.0 Ranger. Last fall, one of the tailpipe tip welds failed and I wound up replacing both tips. I don't remember the exact measurements, except I went to longer and larger tips. Surprised me that the slight drone I had was practically eliminated, and the sound actually became deeper. No, I've done these things enough to know I wasn't imagining anything. The tips exit at the same spot as the previous ones, just longer and larger. FWIW.
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Old 02-20-2019, 03:33 PM
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I mean...there's a chance, but resonance always occurs between 1600-2000 RPM. I have a different setup with 4" x 12" tips and it resonates from 1600-2000 RPM.
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Old 02-20-2019, 05:16 PM
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Originally Posted by ghunt81 View Post
I mean...there's a chance, but resonance always occurs between 1600-2000 RPM. I have a different setup with 4" x 12" tips and it resonates from 1600-2000 RPM.

That's VERY interesting considering that you have 4" x 12" tips. I may just bite the bullet and drop down to the 3" and see what happens.

This is the first time I've had 4" diameter tips, and it's the first time I've had this drone problem. My previous trucks with the 5.4 didn't have this drone issue, and they were all but straight piped with 3" tips out the rear.

I have been noticing that nearly any truck with 4" tips are all very short in length, take a look at any Dodge going down the road with stock 4" tips out the rear and you'll see that they aren't but 6" long at most.
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Old 02-21-2019, 10:43 AM
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Personally I think it has more to do with the muffler and exhaust itself than the tips, but I dunno. You could always try it and find out.
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Old 02-21-2019, 10:47 AM
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Originally Posted by ghunt81 View Post
Personally I think it has more to do with the muffler and exhaust itself than the tips, but I dunno. You could always try it and find out.
Considering that I'm on my second muffler and the sound is still there except just a little quieter with the current muffler, I'm ruling out the muffler as the culprit.

With the muffler out of the equation, I feel like it either has to be the tips or the resonator.
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