"J-Pipe" Drone Solution - Mustang Evolution

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Old 08-19-2015, 07:29 PM   #1
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"J-Pipe" Drone Solution

Hey all,
I was having horrible exhaust drone with my bassani axlebacks (I have an auto) and had tried a couple different things to get rid of it. I had 18" (i think) resonators put on, which helped somewhat, but also made things very quiet. I just had an exhaust shop weld on J-Pipes 31" long onto the mufflers (they will work anywhere on the exhaust) and the drone is now GONE. Just thought I'd share, as I can't stand drone and I figured it might help someone else.
No Drone!!!
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Old 08-19-2015, 08:36 PM   #2
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Congrats! Any chance you have a vid so we can hear?


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Old 08-19-2015, 08:51 PM   #3
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How about a picture of the set up that you came up with?
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Old 08-19-2015, 10:00 PM   #4
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J pipes have been semi popular on camaros for a little while now
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Old 08-19-2015, 10:16 PM   #5
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Yeah, especially on Pontiac GTO and G8 GT's. That's where I got the math to see how long they needed to be. But it worked wonders. I don't have any sound clips, but here are the best pictures I could get of it

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Old 08-19-2015, 10:17 PM   #6
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More pictures

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Old 08-20-2015, 11:44 AM   #7
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So what exactly does it do? I see it adds a bit of weight to the Axle Backs. Is just another way for the sound/exhaust to escape from? It also looks like its pointed right at the axle, not worried about heat issues? What about performance loss?

Sorry for the 50 questions I am curious in this too since i have V6 with the Mac Axle Backs and the drone can be annoying. Thanks! Sam
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Old 08-20-2015, 11:53 AM   #8
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The ends not welded to the mufflers are capped, what it does is bounce the sound back of a certain frequency (determined by what frequency you are droning at) and cancels out that frequency. And since the other ends are capped the exhaust doesn't flow into it as air takes the path of least resistance. They did not change the sound at all other than eliminating the drone. To me, no drone is well worth the few extra lbs.

These work purely based on their length and one end being capped. The objective is to "bounce" sound back into the exhaust system at 1/2 length of the frequency your droning at. the forumla used is:
(1100/y)/4=y then z=(y)*4
y is the frequency at which you are droning (i used an android app to find this)
z is the overall length the "j pipes" need to be
(mine are 30" to target drone at 110hz)

they don't HAVE to be in the shape of a J, they can be any shape, and tie in just about anywhere on the exhaust from my understanding. This also works on any engine, v6, v8, i4, boxer, etc.

this thread goes a little more in depth on the science behind it

http://ls1tech.com/forums/cadillac-c...ltz-tubes.html
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Old 08-20-2015, 12:32 PM   #9
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Wow that's some scientific stuff right there! Congrats on finding a solution!

May i ask how much did it cost you? Thanks.
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Old 08-20-2015, 12:45 PM   #10
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due to that being the only place mine could fit, I paid 250. Would have been significantly cheaper, but i had to buy 3 u-bends for the guy to use. If you could fit them somewhere else (on the midpipes perhaps?) it would be much less.
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Old 08-20-2015, 12:53 PM   #11
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Wow, I wasnt expecting it to be that much. I still have the stock hybrid BS Ford pipe and still have warranty so I dont want to do anything to it. Huh well I guess I will just live with drone for a bit longer.

Thanks for everything!
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Old 08-20-2015, 01:25 PM   #12
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Its a Helmholtz resonator, just like you see on most intakes to muffle engine noise. In certain applications they've actually been used to amplify exhaust waves and create power, but you're getting into snake oil territory there.
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Old 08-20-2015, 01:37 PM   #13
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Yeah...J pipes have been around for a long time.
Solo has them as part of some of their systems.
Solo has tunable J-Pipes ( for the GT) that include a slider end cap (just loosen the band clamp and slide the piece longer or shorter) so that you can fine tune the exhaust note if necessary.
I didn't see any by solo for the V6 but there are many j pipes out there. I think it's a matter of getting them added to you vehicle and ideally, arranged so you can adjust the length without too much trouble, if need be.
Just some food for thought.
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Old 08-20-2015, 03:40 PM   #14
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Sold bassani's + $250 = Borla.
Jk.
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Old 08-20-2015, 03:41 PM   #15
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SEX TRUMPETS!!!!
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Old 08-20-2015, 08:36 PM   #16
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I have the Ford Racing equivalent of the S types, and I liked the sound oh my setup better with the bassanis. I have a custom H pipe and shorty headers (still have cats).
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