The best Daily driver exhaust is the stock exhaust. That is just my opinion but I really do think that is true. If you change any one part of the L99's exhaust you are going to hear the AFM changes (8 cylinders changing to 4). It is kinda of annoying, I know because I run the MBRP 3 inch catback (I didn't pay attention that they only make for the LS3), while the v8 mode sounds absolutely prefect, 4 cyl. sound sucks and is very apparent every time it kicks in. This is a factor you need to consider. The stock exhaust is not a bad sound especially after you get some miles on the car and the computer "learns you". And the stock hides the AFM perfectly, I never heard a change until I switched to MBRP. It's not MBRP product that is bad it's the AFM on the car. LOL MBRP good, AFM BAD
On a side note, I'm considering removing my MBRP and putting the stock back in. The system works great for LS3 but not for L99s (sound wise due to the AFM kick in and not anything to do with the MBRP). So if anyone is interested in them PM me with an offer or any questions.