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Hi all ..
I know lots of threads on this topic, but can't seem to find the answer, so I thought I'd ask .. sorry if this is a dup ...

2013, SS, auto, mostly stock, rally yellow, convertible with stock ground effects

I cut off stock mufflers 3" behind the mufflers and installed MRT GFX to get better muscle car sound.

On startup, they sound great, exactly the type of deeper sounds I wanted.
However, when driving, I am getting very bad drone ... at least I think it's drone. Most always around 1600 rpm in higher gear. As you pass through 1600 (or so) rpms, you get Bummmmmm, then switches to Grrrrrrrrrrrr, then back to Bummmmmmmm (sorry for the bad description), but horribly annoying ... really sounds as though there is a flap in the exhaust flapping at that rpm changing the sound ... is that drone?

Is this something to do with the solonoid flap in the exhaust, that shows itself only with after market exhaust? should I take out the fuse to disable, and see if this is related?

Just for kicks, I took off both new MRT axle back mufflers and drove without, and I get the exact same annoying noise ...

So, this seems to tell me that this droning sound isn't produced by the aftermarket mufflers, but instead isn't cancelled out by the aftermarket mufflers .... So this drone is produced by the car, not the muffler ...

So what now? MRT won't let me return these mufflers ... $475 down the drain ... uggggh ...... have a J-pipe welded on? not sure where to go for that?

I heard another 5gen camaro today with Pypes axle back with no drone ... are some aftermarket muffer kits designed to cancel drone?

Not sure which way to go with this puzzle I have created ...
Any thoughts or advise?

thanks much!!
[email protected]
 

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The only company that guarantees a no drone design is Corsa You may get lucky with other systems.
No gambling involved with the Corsa
We sell a system that fits o.e. ground effects along with it being a automatic and convertible
everything you want in one package.
 

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may be the 8 cylinder cutting back to the 4 cylinder mode. Get a range device or a tune. I have very slight drone @ that rpm with my Garnatelli axleback. Everyone has their own definition and tolerance level for this issue.
 

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may be the 8 cylinder cutting back to the 4 cylinder mode. Get a range device or a tune. I have very slight drone @ that rpm with my Garnatelli axleback. Everyone has their own definition and tolerance level for this issue.
This is exactly what is on mine with the Range AFM killer, love everything about it. No drone and even get the pop, pop ,pop I like when I decelerate.:thumbsup:
 

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have to buy a range device or get a tune or tune device
 

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The only company that guarantees a no drone design is Corsa You may get lucky with other systems.
No gambling involved with the Corsa
We sell a system that fits o.e. ground effects along with it being a automatic and convertible
everything you want in one package.
Solo Mach XL cat back. Great sound with absolutely No Drone.
Corsa AND Solo are both guaranteed drone free. Solo Mach XL catback is what I have and it sounds great with or without headers. It is amazing the drone difference between it and a drone heavy car (which mine was because of some cheap mufflers the previous owner welded on). Solo sounds almost stock cruising around, but when you get on it the car gets loud. Add headers and the car can get ridiculous while being awesome!
 
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