Go with Chase, the scoop will help. The cost is really not much. I going to get mine next then work on the exterior more. I'm trying to stay away from a tune until I am out of warranty tho.
Just my opinion on gears, if your not regularly drag racing I don't see a reason. I am very happy with the stock setup myself. Could use some more off the line but you get that with the V6 and low torque.
Heavy Chevy 2013 VR 1LT RS
Magnaflow Cat Back - K&N Typhoon - Apex Scoop & Bottle - VMax Ported Throttle Body Build Journal