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.
2015 1SS 1LE
Stock for now.........