Cat-Back exhaust system question/issue

[Rubybarchetta]

Hello All,
I have 2015 GT 5.0.
Installed a used Cat-Back system with an H-tube crossover.
When In 6th gear running approx. 1800-1900 (or less) RPM, I am getting a very loud annoying 'reverb-drone" tone from the system inside the cabin.
Goes away upon acceleration or deceleration. Present on straight line without rpm variation.
So, I was wondering if it might be due to the H-tube crossover causing this reverb effect at lower RPM,s
Anyone run this system ?
Curious if the X-Pipe crossover would work better.
As I understand it, an X-pipe crossover may be a bit quieter than the H-Pipe because of an increase in overall exhaust flow.
Anyone have real world practical experience regarding this or the issue I mentioned above ?
Thanks for your thoughts.

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[Jkcpsal]

I have the same system with the x pipe, bought the car with it about a month ago. Sounds the same here, I am thinking about having j pipes welded on, was looking to maybe replace either the mid mufflers or the end ones but j pipes should be the cheapest option. Hoping if I can get rid of the drone I will be happy with it, I don't think it's too crazy loud like Corsa extreme. I have stainless workers headers with cats also

 

[GregO]

Anyone have real world practical experience regarding this or the issue I mentioned above ?
Thanks for your thoughts.

It’s the rear mufflers, they are not designed to cancel typical drone frequencies.
H-pipe, X-pipe, No-pipe will not change the drone.
At the end of the day it’s the rear muffler design that kills drone such as AWE or CORSA, Borla does a good job but I can’t stand fiber packed mufflers.
Rear Helmholtz should do the trick. Depends what you want to spend.
Something like this Thermal R&D gets it done effectively.

 

[Rubybarchetta]

Rear Helmholtz should do the trick. Depends what you want to spend.
Something like this Thermal R&D gets it done effectively.

Thanks for the info !
I'm seriously considering this system.

 

[Rubybarchetta]

Purchased the Thermal system, will report back after install and testing.
All reviews I've seen or read are positive and indicate No-Drone.
Company is impressive, go check out their videos.
https://thermalrd.com/pages/why-thermal-exhaust
BTW - If considering this call Jay or Kenny at Hypermotive. https://www.hypermotive.com/

 

[Rubybarchetta]

Thank you GregO for the recommendation:
OK, So I installed the Thermal R&D system. I am very impressed ! It has a deep tone and there is absolutely NO drone at any speed or RPM. Install took about 2 hours. The cabin is quiet enough to hear the stereo and I don't have to blast it. Granted, this system may not be as loud as some others on the market but I didn't want super loud, was looking for a nice deep low muscle car tone and is louder than stock. I highly recommend this system.
https://thermalrd.com/

 

[stannypack]

I might just be a menace or insane or both but I can't wait for the drone on my mbrp race previous owner said the cops pulled him over to give him warnings about it too

 

[Rubybarchetta]

Purchased the Thermal system, will report back after install and testing.
All reviews I've seen or read are positive and indicate No-Drone.
Company is impressive, go check out their videos.
https://thermalrd.com/pages/why-thermal-exhaust
BTW - If considering this call Jay or Kenny at Hypermotive. https://www.hypermotive.com/

I've had the Thermal R&D on for quite a while now and I still love it. Deep muscle car tone and sounds awesome idling or running.
Absolutely no drone. I highly recommend his system.

 

[steathv]

Purchased one for my A10, droned going up hill in higher gears, not pleasant, reworked most of the exhaust with additional resonators

 

[yellowstangatl]

The MBRP race cat back on the 18+ mustangs has built in heimholtz resonators and no drone. I had it on my 2019 and loved it.

 

[Free Spirit]

Thank you GregO for the recommendation:
OK, So I installed the Thermal R&D system. I am very impressed ! It has a deep tone and there is absolutely NO drone at any speed or RPM. Install took about 2 hours. The cabin is quiet enough to hear the stereo and I don't have to blast it. Granted, this system may not be as loud as some others on the market but I didn't want super loud, was looking for a nice deep low muscle car tone and is louder than stock. I highly recommend this system.
https://thermalrd.com/

I installed milt thermal system recently, do you have any photos of the back half of your system? Trying to find out if thermal sent me the wrong system

 

[Rubybarchetta]

I installed milt thermal system recently, do you have any photos of the back half of your system? Trying to find out if thermal sent me the wrong system

No I don't but may be able to take few pics.
I'm curious, what is it about your system that you feel you may have gotten the incorrect unit ? Does it not fit properly ?

 

[Free Spirit]

No I don't but may be able to take few pics.
I'm curious, what is it about your system that you feel you may have gotten the incorrect unit ? Does it not fit properly ?

The images I see online/in for sale posts. I'm here show the rear section to be a straight tube with the helmholtz being separate (basically a muffler delete with a tube of to the side). The set I received looks like plain old mufflers and doesn't match any photos but thermal doesn't offer photos on their own website so I can't compare it

 

[Rubybarchetta]

Hmmm, quite interesting
I'll post some pics later today

 

[JTM88]

The images I see online/in for sale posts. I'm here show the rear section to be a straight tube with the helmholtz being separate (basically a muffler delete with a tube of to the side). The set I received looks like plain old mufflers and doesn't match any photos but thermal doesn't offer photos on their own website so I can't compare it

I know on the 18-23 the helmholtz is built into what looks like a standard muffler. I wonder if they changed that for the 15-17s

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