Exhaust Question

[C. Hart]

I have seen different people in different places post different sizes of exhaust as stock for my 2014 Sierra L83. Some say 2.5 some say 2.75.

I am considering replacing the muffler with a Dynomax Super Turbo, perhaps 17739.  I had the factory L83 5.3 replaced with another L83 5.3 from Jasper Engines. I also put new Walker Cat / Y pipe on. I would appreciate opinions suggestions about what would be a good muffler setup. My main interest is a low rumble and the best flow / fuel mileage I can get. Not interested in straight through glass packs or loud exhaust. Those days are way behind me now. 

Thanks Guys.  

[KARNUT]

29 minutes ago, C. Hart said:

I have seen different people in different places post different sizes of exhaust as stock for my 2014 Sierra L83. Some say 2.5 some say 2.75.

I am considering replacing the muffler with a Dynomax Super Turbo, perhaps 17739.  I had the factory L83 5.3 replaced with another L83 5.3 from Jasper Engines. I also put new Walker Cat / Y pipe on. I would appreciate opinions suggestions about what would be a good muffler setup. My main interest is a low rumble and the best flow / fuel mileage I can get. Not interested in straight through glass packs or loud exhaust. Those days are way behind me now. 

Thanks Guys.  

You won’t do better than stock exhaust without headers. Just put your favorite muffler on it and it will do the job. 

[ftwhite]

I’m have Magnaflow. Good low note, not loud. However, with aftermarket y pipe and cats, and aftermarket engine, I am surprised you didn’t already do headers. Stock type manifold? That will change the exhaust note a lot to any downstream piece. 

[newdude]

22 hours ago, C. Hart said:

I have seen different people in different places post different sizes of exhaust as stock for my 2014 Sierra L83. Some say 2.5 some say 2.75.

I am considering replacing the muffler with a Dynomax Super Turbo, perhaps 17739.  I had the factory L83 5.3 replaced with another L83 5.3 from Jasper Engines. I also put new Walker Cat / Y pipe on. I would appreciate opinions suggestions about what would be a good muffler setup. My main interest is a low rumble and the best flow / fuel mileage I can get. Not interested in straight through glass packs or loud exhaust. Those days are way behind me now. 

Thanks Guys.  

 

 

Fuel mileage?  That's all how you use your right foot.  Exhaust will give you sound.

 

Stock exhaust 5.3 is 2.75" diameter piping.  

 

If the truck is nice and worth putting some $$ into it, I'd go for a Corsa catback.  I had one on my 2019 old body 5.3 and it was just perfect.  Zero drone, just driving around and cruising on the highway you'd think it was stock, but when you opened it up it was like a Camaro with the factory dual mode.  Corsa bumps their catback to 3in diameter.  

Edited August 14 by newdude

[MikeBMW]

I went with Borla Touring cat back exhaust.
I thought about the ATAK but figured my neighbors might prefer a bit more quiet.