Highway drone with Magnaflow - GMC Sierra

[V8 Power]

Well wouldn't you just know it.
I just got a 14inch Magnaflow installed a few days ago after having a really bad experience about a year ago with a flowmaster 40. I love the way this Magnaflow sounds around town especially above 2000 RPMs but today I drove over 120 miles on the highway and the drone was really getting to me after awhile. Last time this happened with the flowmaster I just resorted to putting the stock muffler back on. However I'd really like to keep this Magnaflow if I could.

I searched around and found that rotating the muffler 90 degrees so that the oval is in the "vertical" position rather than horizontal might help. Also I noticed people have said to put a resonator in front of the muffler but I couldn't find any part numbers.

Any help or advice would be appreciated as I'm already considering having the stock put back on and losing another $100 bucks (again).

 

[CJ Hungus]

Yes put a resonator in front of it. I'll try to dig up Incongnito's thread about his magnaflow install.

 

[CJ Hungus]

Here it is: http://www.truckmodcentral.com/forums/showthread.php?t=6543&highlight=magnaflow&page=2

 

[GATOR CREW]

I would Dynamat or Fatmatt your floor and back wall of your cab....did mine and makes a huge difference. I have just a magnaflow muffler that is dumped and I hear nothing unless thw back windows are down!!!

 

[JOEGMC]

I recently installed a Magnaflow, (12158) and I know about the drone. I placed Dynamat in the rear half of the truck, and while it did decrease it, it DID NOT eliminate it.

It's loudest drone for me is at 1800 to 2000 RPM in my CC. Problem is, at 70 mph, I'm at 1800.

I recently listened to 10hrs of the DRONE.......I still love my flow tho!

 

[PenguinLTZ]

I love my Magnaflow, and the Magnaflow 5" resonantor muffler.

It is kick ass. Nothing drones like a 6.0, and I have absolutely NO drone, at all...

 

[Sodbuster]

I recently installed a Magnaflow, (12158) and I know about the drone. I placed Dynamat in the rear half of the truck, and while it did decrease it, it DID NOT eliminate it.

It's loudest drone for me is at 1800 to 2000 RPM in my CC. Problem is, at 70 mph, I'm at 1800.

I recently listened to 10hrs of the DRONE.......I still love my flow tho!

More power to ya Joe....10 hours would drive me

 

[JOEGMC]

I love my Magnaflow, and the Magnaflow 5" resonantor muffler.

It is kick ass. Nothing drones like a 6.0, and I have absolutely NO drone, at all...

Thanks for that information!

 

[JOEGMC]

I recently installed a Magnaflow, (12158) and I know about the drone. I placed Dynamat in the rear half of the truck, and while it did decrease it, it DID NOT eliminate it.

It's loudest drone for me is at 1800 to 2000 RPM in my CC. Problem is, at 70 mph, I'm at 1800.

I recently listened to 10hrs of the DRONE.......I still love my flow tho!

More power to ya Joe....10 hours would drive me

..It was quite difficult listening to "Vinyl Classics" on the XM radio,due to the Drone, so I cranked it loud.

I'm basically(hopefully) temporarily deaf, here for a few hours or days!

 

[stadt11]

Well wouldn't you just know it.
I just got a 14inch Magnaflow installed a few days ago after having a really bad experience about a year ago with a flowmaster 40. I love the way this Magnaflow sounds around town especially above 2000 RPMs but today I drove over 120 miles on the highway and the drone was really getting to me after awhile.

I heard about this a lot when researching mufflers, that's why I decided on the Flowmaster 50 SUV. Good luck with decreasing drone though.