Need to kill Magnaflow Y Pipe and catback drone - Page 2 - Defender Source
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  #21  
Old August 8th, 2014, 04:47 PM
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Quote:
Originally Posted by blaughva View Post
I really believe it is engine exhaust drone, but I'll give that a shit just to be sure.
If so, then the drone should occur at the same RPM in all gears. Minutes to check that.
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  #22  
Old August 8th, 2014, 05:24 PM
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Quote:
Originally Posted by down_shift View Post
Engine exhaust drone or exhaust line vibrating drone? There is a chance +/- 70mph happens to be the natural harmonic frequency of your exhaust system when coupled with the other vibrating items. For a test, try wedging something between the frame and exhaust to stiffen it, like a 2x4 cut to size. Strap it down so it does not fly off. If that works, dump the wood and try adding another pipe hanger or two.
Its the exhaust.
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  #23  
Old August 9th, 2014, 08:27 AM
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Originally Posted by blaughva View Post
Clay, any chance you have a pic you can share?
The exhaust up is secured to the tank cradle.
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  #24  
Old August 9th, 2014, 09:10 AM
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Originally Posted by 1of40 View Post
The exhaust up is secured to the tank cradle.
Thanks Clay. I appreciate it!
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  #25  
Old August 9th, 2014, 08:27 PM
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Add a cheap glasspack muffler as a resonator.
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  #26  
Old August 11th, 2014, 10:10 AM
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Took the truck by a local muffler shop and was told there wasn't enough straight pipe to put in a resonator. Apparently you need at least 12". So my only remaining options are to swap out the muffler and/or move the exhaust tip to exit the rear like Clay suggested.

While having my morning coffee though, I wondered if using Dynamat Extreme inside the wheel well and then spraying bedliner over it would make a difference. There is a lot of space in there for sound to rattle around next to the exhaust tip. Thoughts?
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  #27  
Old August 11th, 2014, 10:29 AM
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I seriously doubt it would make a difference using dynamat. The resonators I've seen on D90's went in toward the end of the pipe...maybe there are different sizes?
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  #28  
Old August 11th, 2014, 10:56 AM
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Quote:
Originally Posted by blaughva View Post
While having my morning coffee though, I wondered if using Dynamat Extreme inside the wheel well and then spraying bedliner over it would make a difference. There is a lot of space in there for sound to rattle around next to the exhaust tip. Thoughts?
No. That's not the problem nor is it the solution.

The muffler should be a pretty standard size, so swapping it out and bolting in another shouldn't be an issue. Plenty of people have been doing it with their magnaflows and Borlas lately.
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  #29  
Old August 11th, 2014, 10:58 AM
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FYI, I have the Borla SS cat-back on my ST and the tip is over twice the diameter and is neither out the side (stock) nor out the back, as Clay shows. It's also angled down a bit to direct down and back. I get a pleasant mellow tone throughout the RPM range, although, yes, MUCH quieter with just a surrey top! Good luck as it clearly bugs the crap out of you!
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  #30  
Old August 11th, 2014, 12:50 PM
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Place a quality 12" resonator (one that doesn't have scalloped metal scoops impeding the sirflow..ie..cheery bombs). Another alternative is to place the muffler underneath and a resonator at the tip. Stock exhaust are almost always restrictive. The drone is coming from the exhaust pulses at a given rpm. This appears in every system. The trick is to move that frequency to a rpm that you're not normally cruising at.
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  #31  
Old August 11th, 2014, 01:11 PM
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Yes...2800 RPM is the magic number for the most drone...
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  #32  
Old August 11th, 2014, 01:22 PM
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Quote:
Originally Posted by ezzzzzzz View Post
Place a quality 12" resonator (one that doesn't have scalloped metal scoops impeding the sirflow..ie..cheery bombs). Another alternative is to place the muffler underneath and a resonator at the tip. Stock exhaust are almost always restrictive. The drone is coming from the exhaust pulses at a given rpm. This appears in every system. The trick is to move that frequency to a rpm that you're not normally cruising at.
The problem I've run into with the resonator is there are no straight sections on the pipe long enough to accommodate it.
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  #33  
Old August 11th, 2014, 01:24 PM
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Quote:
Originally Posted by blaughva View Post
The problem I've run into with the resonator is there are no straight sections on the pipe long enough to accommodate it.
Alright sell me your truck...
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  #34  
Old August 11th, 2014, 01:32 PM
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I vote for a walker quietflow SS or some other real muffler inline.

Resonators are ok for fine tuning NVH but to do the massive amount of lowpass filtering you need (it sounds like the drone is horrendous and probably gets worse the faster you go) would require a pretty long, large diameter resonator.

Unfortunately it looks like you'll have to go custom or cut up the cat back
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  #35  
Old August 11th, 2014, 01:48 PM
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Quote:
Originally Posted by sonoronos View Post
I vote for a walker quietflow SS or some other real muffler inline.

Resonators are ok for fine tuning NVH but to do the massive amount of lowpass filtering you need (it sounds like the drone is horrendous and probably gets worse the faster you go) would require a pretty long, large diameter resonator.

Unfortunately it looks like you'll have to go custom or cut up the cat back
At this point I have no problems cutting up the catback. A few more months and the problem will solve itself.... I'll be deaf.

Is Walker the best aftermarket muffler option?
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  #36  
Old August 11th, 2014, 02:15 PM
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Originally Posted by blaughva View Post
Is Walker the best aftermarket muffler option?
Unfortunately, they are one of many mediocre options. Stock muffler being the quietest.

I don't know which mufflers are the best, but minimum requirements are 304 Stainless and good internal baffling.
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  #37  
Old August 11th, 2014, 02:36 PM
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Originally Posted by sonoronos View Post
Unfortunately, they are one of many mediocre options. Stock muffler being the quietest.

I don't know which mufflers are the best, but minimum requirements are 304 Stainless and good internal baffling.
why is stainless a minimum requirement?

If you check out Flowmaster's website they have a range of mufflers and describe them. Walker makes a lot of components for other exhaust companies but is also owns Dynomax and Thrush.

Beyond this I can't offer much advice as I managed to tame my exhaust drone by adding Super Swampers!
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  #38  
Old August 11th, 2014, 04:21 PM
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Originally Posted by jefhuf View Post
why is stainless a minimum requirement?
Because as you know I care about useless things

But quite honestly I have had so many non-stainless aftermarket mufflers rot out within a year that non-stainless is no longer an alternative for me
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  #39  
Old August 12th, 2014, 07:34 AM
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Brad, your exhaust currently exits out the side right? I positioned mine about an inch more outside the driver's side and that seemed to help with me.
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  #40  
Old August 12th, 2014, 08:13 AM
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Originally Posted by rankar View Post
Brad, your exhaust currently exits out the side right? I positioned mine about an inch more outside the driver's side and that seemed to help with me.

Randy, as you see in the pics, mine barely makes it outside. I have wondered if this was an issue as the stock pipe was out at least another two inches.
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