We cut the muffler out completely. Left the stock cats, and it sounds pretty good. Actually not too loud. Thought it was going to be much louder, so we may change out the cats later. This took about 10 minutes. Sounds so much better!

2006 Chevrolet Tahoe 5.3L V8 stock engine
6” Lift 35”x12.5” Tires

Filmed on iPhone 11 Pro
1080 30fps