Magnaflow muffler upgrade on 2021 Tahoe with 5.3

[Fireman591]

Well I finally pulled the trigger on my 5.3 2021 Tahoe for a muffler upgrade. I cut out the stock BBQ grill sized muffler and welded in a 18 inch MagnaFlow Performance Muffler model 12259. I left the flapper and resonator. The sound is just a tad louder but the sound is much deeper than the stock muffler. Overall I am happy with the upgrade. The muffler was $141 on Amazon and I paid $100 for the install.

 

[EmsUSMC]

What inlet and outlet size?

 

[blondie70]

I think it's 2 1/2". I did the same thing, but removed the resonator. I like the sound. Like to hear my engine a bit. Not sure of my Magnaflow model #.