ROUSH axleback unbalance notes - Ford Mustang Forum
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post #1 of 13 (permalink) Old 11-23-2018 Thread Starter
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ROUSH axleback unbalance notes

Hi members. Good day to all.

I would like to ask especially to those who have a roush axlebacks on their GTs. My 2014 mustang GT has a roush axleback installed. I started the engine using the newly installed remote starter. So I remote started the engine, and that was the first time i heard my car started from the outside, and while I’m at the back, i noticed that both sides has a different sounds coming out. I mean, the right side has a bubbly “blup blup” note, while the left side has the “deep bass” kinda thing note. Is this normal? Or both sides should sound equal? Does anybody from here has the same situation? Or is it just mine and perhaps due to a leak or something? Please guys i need your advice. Thanks in advance. God bless us all.

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post #2 of 13 (permalink) Old 11-23-2018
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Echos off the nearby houses? Cold start? After warm-up it will sound different.



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post #3 of 13 (permalink) Old 11-24-2018 Thread Starter
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Echos off the nearby houses? Cold start? After warm-up it will sound different.

Hi. After the engine is fully warmed up. The other side sounds different from the other. And I am sure the car was in an open area and nothing is behind it when I noticed that.
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post #4 of 13 (permalink) Old 11-24-2018
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The only way both sides are going to sound equal is if ALL the exhaust pipe pieces on both sides of the engine are of exactly the same diameter, exactly the same length, and bent all exactly the same way, and believe me, that ain't the case.

What's important is what the exhaust sounds like while Camaro's shrink in the rear view mirror.
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post #5 of 13 (permalink) Old 11-24-2018
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Dont the coyote motors have a catalytic converter on one exhaust manifold and not the other? Even so I'm thinking the h pipe would help even the tone a little
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post #6 of 13 (permalink) Old 11-24-2018
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Dont the coyote motors have a catalytic converter on one exhaust manifold and not the other?
No, they have a cat on both sides.
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post #7 of 13 (permalink) Old 03-07-2019
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Mine both sound the same.
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GO BIG OR GO HOME
5.0 coyote
BBK cold air intake
SCT tuner with 91 tune
roush axle back
Go BILLS

91 tune
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post #8 of 13 (permalink) Old 03-08-2019
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Quote:
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Dont the coyote motors have a catalytic converter on one exhaust manifold and not the other? Even so I'm thinking the h pipe would help even the tone a little
I wouldnt be concerned about an "even note" between pipes unless the car was running terrible.

Does it start, drive, feel, perform right? If yes, then send it every chance you get. You'll soon realize you dont care that the notes are uneven, you'll just love that sound of 'Murican freedom screaming out your car's ass at WOT

Whippled 2011 Mustang GT Yellow Blaze Tri-Coat * 2.9L Gen 3 Stage 3 Supercharger * 6MT * 3.73 * ARH Long Tubes and O/R H * SLP Loudmouth A/B * Lund Tuned * lowered 1.5in * MGW 1st gen Race-spec Shifter * Avant Garde M310s 20x9/20x10 with 265/35 Nitto 555s up front 315/35 INVOs in the back *

EXTREMELY fun daily driver!
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post #9 of 13 (permalink) Old 03-08-2019
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There are different tones to cancel out each other to stop the drone. My Borla S-Type exhaust does the same thing and there is NO drone on the highway


2014 GT Premium, Track Pack, Barton shifter, Borla S-type exhaust, Resonator delete, 3.73 gears, Airaid C.A.I., 93 Race Tune, JLT Oil Separator
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The only mods to my exhaust are GT500 Axlebacks. They sound the same (from each pipe) hot or cold.

ROUSH exhausts are more aggressive and crackly to start with... Lots of blurbing and blubing in there too....


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I think Borla are the best because of not having drone. The Roush do have drone at certain rpm I thing around 2000 not fully sure. Luckily I have a manual and can change gears to get rid of that unwelcoming noise. People with auto trainees and the Roush may have to deal with the drone a little more often.

GO BIG OR GO HOME
5.0 coyote
BBK cold air intake
SCT tuner with 91 tune
roush axle back
Go BILLS

91 tune
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Quote:
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I think Borla are the best because of not having drone. The Roush do have drone at certain rpm I thing around 2000 not fully sure. Luckily I have a manual and can change gears to get rid of that unwelcoming noise. People with auto trainees and the Roush may have to deal with the drone a little more often.

Try straight piped like my setup.. lol ARH 1-7/8 X 3, O/R H-pipe, SLP LM muffler deletes.. let.. freedom... ring lmao


Thank God for 3.73 rear gears and 70mph speed limits, the drone eats your soul at 65mph, 70, its GONE

Whippled 2011 Mustang GT Yellow Blaze Tri-Coat * 2.9L Gen 3 Stage 3 Supercharger * 6MT * 3.73 * ARH Long Tubes and O/R H * SLP Loudmouth A/B * Lund Tuned * lowered 1.5in * MGW 1st gen Race-spec Shifter * Avant Garde M310s 20x9/20x10 with 265/35 Nitto 555s up front 315/35 INVOs in the back *

EXTREMELY fun daily driver!
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Quote:
Originally Posted by 2012bigredstang View Post
I think Borla are the best because of not having drone. The Roush do have drone at certain rpm I thing around 2000 not fully sure. Luckily I have a manual and can change gears to get rid of that unwelcoming noise. People with auto trainees and the Roush may have to deal with the drone a little more often.
I have Roush axle backs and don't notice any drone at all, so not sure where that's coming from. My buddy has a 2014 too, and he says same thing when he gets in my car, that there's no drone. His drone like crazy (NSX I think), so he notices the lack of drone right away. The no drone is one of the reasons I went with Roush (I read a ton of reviews before purchasing, and no drone came up a lot in reviews). If you have drone, it's probably the result of some other modification you did. Roush are designed to work with stock cars.

2014 Mustang GT Premium 401a; "Now you can add Premium to your signature." - Thereaper
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