I hate to keep beating a dead horse, but whip-crack! About 2 months ago I had a Magnaflow 5"x8" muffler, I think #12229, installed on our 08 Denali XL. I also did a resonator delete with some off the shelve brand dual tip side exit set up. I definitely noticed the drone inside the cab at mid range rpm's but thought I'd get used to it. After a looong road trip, it got really annoying. I called the shop who installed everything and he suggested adding a straight though design resonator between the engine and the muffler to cancel out some of the drone, cost about $120 installed. I still want the truck to be loud and perform well, but I gotta fix the drone. Should I just add the resonator or swap out the muffler for a different size or different brand? Let the debate begin.....again.
Denali Magnaflow Drone?!
- Thread starter Garret813
- Start date
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Zed 71
Full Access Member
Corsa. A resonator may reduce it, but you will need to test which size would be the best.
I have a magnaflow 5x11x22 an I was experiencing the same thing an after reading another post which stated that the pipe after the muffler creates the drone so the poster just cut that pipe off an added a 16" slanted tip an that killed the in cabin drone an made the exhaust sound even better this set up worked fine for me an but both setups were done on NBS I'm not to sure about the NNBS
04ctd
Full Access Member
i think the muffler shop is just talking about adding a striaght thru bullet style glass pack in front of the muffler.
you can do that yourself for ~$50, and buy some tools if needed, then you have the
tools, and you can change it around later if you want
http://www.amazon.com/Flowtech-50250FLT-Hots-Glass-Muffler/dp/B0002M9PBQ
exhaust pipe expander
$24
http://www.google.com/products/cata...=X&ei=v2scTvSzGKW10AHl65G9Bw&ved=0CFcQ8gIwAg#
you can do that yourself for ~$50, and buy some tools if needed, then you have the
tools, and you can change it around later if you want
http://www.amazon.com/Flowtech-50250FLT-Hots-Glass-Muffler/dp/B0002M9PBQ
exhaust pipe expander
$24
http://www.google.com/products/cata...=X&ei=v2scTvSzGKW10AHl65G9Bw&ved=0CFcQ8gIwAg#
InTruckDesign
Full Access Member
I have a Magnaflow 5x11x22 and it also drones in the cruising RPM range...to me it is not bad and my wife does not complain so.... anyways I have been thinking about dumping the exhaust right after the axle, may have to play around with adding a 16" slant tip, if it helps great if not oh well I can live with it.
You will luv the sound trust me
Zed 71
Full Access Member
I removed the resonator some time later after the Magnaflow was installed. It is dumped after the rear axle, and there was no change in exhaust drone.
That's an interestting theory b/c the pipe after the muffler is just a quick fix pipe the shop made to hold the tips. I'm not thrilled with the tips I currently have either. I'm thinking about getting the SLP delete kit and putting that after the muffler to see if it helps fix it.
