the five inch straight is getting to me... I did some looking through threads but havent really found what im looking for... so what is the quietest muffler out there that will still flow well? my dream would to be quiet as stock so i can just listen to that silver 62 spool... suggestions?

 

you could slap a resonator on, first, and see if that knocks down the drone. if you dont like just running the resonator, then you can put a muffler on it.

I am running a resonator and a muffler, and I like it

 

Donaldson M100580

It's 51x10 w/ 5" in and out. Very quiet with good flow. I just put one on my truck and I love it.

 

I have a Donaldson M090535. It's a straight-through muffler, with a venturi-like choke point that forces exhaust flow around it, recombining at the rear of the muffler canceling the noise.

Benefits of this muffler?

-You can hear the turbine through the exhaust at low throttle because there is no packing to get rid of the high-frequency sounds
-It sounds very deep in the cab, but not too loud until you're towing heavy
-It sounds very good with the windows rolled up
-It's CHEAP! Only about $70 delivered from Ryder Fleet Products.

Drawbacks?

-There is a pffffff noise (for lack of a better term) at idle and any throttle setting caused by the perforations in the core.
-At WOT it does not sound so great, at least with my stock turbo. It does, however, effectively cancel out most of the sound. There is no 3rd gen raspiness to speak of.

Another option is to get a Shuttleworth muffler. I have not heard one in person, but Paul Fox at Defiant Truck Products (he installed my Donaldson) tells me the muffler works just like a Donaldson, but the perforations are much bigger, which negates the "PFFFFF" sound. I had already purchased my Donaldson, otherwise I'd be running a Shuttleworth.

I think Paul is distributing the Shuttleworth. You may want to give him a call.

With all the resonated mufflers, you run into an issue where they soot up and get progressively louder as they age. They also cancel out that killer turbine sound from the exhaust. I'd recommend a mechanical noise-canceling muffler over a resonator style. I've run both, and prefer the Donaldson/Shuttleworth/Aeroturbine designs.

 

Aero turbine 5050Xl is awesome...still has a nice bark but nice and quit while driving..

 

The one I mentioned above has four baffles rather than the 2 that this one has and yet flows plenty. It sounds stock in the cab at any rpm with a nice tone outside.

 

I second what he said. Got the same one on my truck. Very quiet.

 

Have you noticed any mpg gain or egt reduction?

 

I have a magnaflow and it sounds not to bad.

 

i like both of the donoldsons mentioned we tried the 5050xl one trip towing and it is in the scrap pile

 

care to pull it out of the scrap pile and ship it to me? I love my 5050XL on my '08 and wouldn't mind having a second in case i get a wild hair one day and decide to put a 5" TBE on my '01 dually.

 

another member beat you to it but have three 4040xl's still in the scrap pile two of them are connected if some one wants either or both they are yours for the postage

 

i dont see how you guys like that donaldson

it muffles really good

too good for me!

just like a straight pipe is too loud for cross country

that donaldson is just too quiet

i tried 3 different muffs before settling on the straight thru thing i have on there now

love it to death

can still hear all the cool sounds but unless the window is down all i really hear is the s300

i am sure any of the straight thru glass pack style muffs would sound the same

if you stand on her she gets loud, but thats about it...

 

Hey, how are ya? I see this message is from a while ago, but if you still happen to have those 4040's around I'll pay the shipping for them. Let me know!