I mentioned earlier that the Flowmaster 50 SUV sound is what I recommend. I still do. Actually for your info I recommend the Flowmaster 17419 Dual catback kit. The sound is perfect on the Tahoe.
However if you plan to add Long Tube headers Expect the sound to increase. I figured I'd ad this info for you. I recently added LT Headers no cats and my wife was not to pleased with the sound. Then again it's still new to me and I have been a little harder on the pedal increasing the sound because I personally like it. She quickly got used to it & I don't really care about her opinion since she has her own vehicle. I have gotten compliments on the sound from young and old men on the new set up. Anyways just something to keep in mind if you plan to.