My 09 G37S...advice?
I was thinking of doing high-flow cats and a cat back. I've seen a few suggestions, but I need to know what will give the best balance of performance while keeping the car VIP. Now what's this about 180 painting the headlight housings (sorry, still new to the game!)? And I did change the door panel tweets and put two punch 10's in the trunk with a punch amp.
The Link for 180Custom they do more than just headlights...
Link
I have Berk HFC with FI exhaust Gives the car a very nice sound...it should keep it VIP...good deal on upgrading the audio...my audio just got completed.
Check out the Motordyne resonated test pipes... or if you prefer HFCs, the ones from ERZ are very affordable, and have held up well for me here in Chicago. Exhaust? Fast Intentions cat back. 
