Switching out exhuast...MRPB, Black Widow or Dirty Deeds

Adair · Oct 17, 2016

16" dirty deeds

I had a magnaflow muffler cut in and it was about like stock. I recently installed a 16" dirty deeds and just love it. Yes you can hear the exhaust any time you accelerate. But at constant speed it does not drone. The only sound is exhaust. My stock radio and less than half volume drowns out the exhaust going down the road. If you will be more disappointed if it is too quiet, get the 16", but if you are worried about too loud, get the 20".

Freedom · Dec 12, 2016

I have a dirty deeds 18" system. Not raspy at all. Nice and deep. No drone and not that bad at all volume wise on the freeway at 65mph. I only have a 100+ miles on it though. I am more then happy with the sound.

hilgerone · Mar 21, 2017

CarmanKyle said:
Since the Raptor isn't my daily I don't realize how bad it is until I drive it for a bit. Love the way it sounds at WOT, but at certain RPMs and loads the sound feels like its melting my brain haha. I've had all sorts of loud cars and this is by far the 'droneiest.' I plan on either selling it or chopping it all up and making a side exhaust set up to maybe get the sound out of the cab.

Curious what you ended up doing and how you like it.

I installed the MBRP turndown with no resonator and while I love the sound, the drone around 18-1900 rpm is a little annoying.

I've contacted MBRP about a quote to add the side exit pipe. Has anyone changed from a turndown to a rear/side exit on the same muffler? Does it help with the drone?

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CarmanKyle · Mar 21, 2017

hilgerone said:
Curious what you ended up doing and how you like it.

I installed the MBRP turndown with no resonator and while I love the sound, the drone around 18-1900 rpm is a little annoying.

I've contacted MBRP about a quote to add the side exit pipe. Has anyone changed from a turndown to a rear/side exit on the same muffler? Does it help with the drone?

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I ended up selling it, and doing my own side exhaust. I feel the biggest thing to help drone is to get the sound out from under the truck.

hilgerone · Mar 21, 2017

CarmanKyle said:
I ended up selling it, and doing my own side exhaust. I feel the biggest thing to help drone is to get the sound out from under the truck.

Yeah I figured I'd go cheap with the turndown for starters then add the pipe later if it was really annoying. Hopefully getting the end of the pipe to the back makes a difference.

Not sure if any drone actually resonates out of the muffler itself.

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Freedom · Mar 27, 2017

A quick recap after 2000 miles of having my Dirty Deeds 18-inch exhaust. It is definitely loud when you step on it and has a great Rumble with any acceleration at all. I'm complimented all the time. With the cruise on on you could barely tell it's there unless your going up hill ( I have a AFE intake as well just wanted to note that). It's not drone you here just an impressive exhaust Rumble. I put a 5 inch slash cut exhaust tip turned sideways on it, and it is flush with the cab. I am more than happy with this exhaust period. I would do it again

IHAVETWO · May 25, 2017

I have a mbrp exhaust on my 14.sounds great around town.drone kills you on highway

dirtydeeds · May 26, 2017

CarmanKyle said:
I ended up selling it, and doing my own side exhaust. I feel the biggest thing to help drone is to get the sound out from under the truck.

Drone is a very narrow frequency that doesn't have anything to off set it. In other words you only hear the one single frequency and that's it.

When you dump under the truck that frequency causes the body of the truck to vibrate at the same frequency as the exhaust. When these two noise sources resonate together it's annoying and is heard as drone.

There isn't much you can do with that type of drone.

Another source of drone is that same resonation, but with a full exiting tailpipe. This drone is super easy to fix as I've proven on countless raptors. A simple helmholtz resonator to cancel out the unwanted frequency of 130hz.

Another fix for drone technically fixes it, but in reality you still hear it as drone. Just make all the other frequencies louder. Rather than making 130hz quieter. But then this really loud exhaust all the time is heard as drone to us.

mindgame100 · May 27, 2017

Dirty Deeds hands down.. Nice and quiet when idling and cruizing... Loud when opening up on the road... No droning what so ever!! Winner, winner, chicken dinner

hilgerone · Jun 6, 2017

dirtydeeds said:
Drone is a very narrow frequency that doesn't have anything to off set it. In other words you only hear the one single frequency and that's it.

When you dump under the truck that frequency causes the body of the truck to vibrate at the same frequency as the exhaust. When these two noise sources resonate together it's annoying and is heard as drone.

There isn't much you can do with that type of drone.

Another source of drone is that same resonation, but with a full exiting tailpipe. This drone is super easy to fix as I've proven on countless raptors. A simple helmholtz resonator to cancel out the unwanted frequency of 130hz.

Another fix for drone technically fixes it, but in reality you still hear it as drone. Just make all the other frequencies louder. Rather than making 130hz quieter. But then this really loud exhaust all the time is heard as drone to us.

So in my case with the mbrp turndown, do you think extending it out the back would or would not eliminate the drone?

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Switching out exhuast...MRPB, Black Widow or Dirty Deeds

Adair

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Freedom

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hilgerone

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CarmanKyle

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hilgerone

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Freedom

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IHAVETWO

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dirtydeeds

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mindgame100

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hilgerone

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