The tuner will be the best thing for your car because of the shift point adjustment on the auto....as far as the jlt cold air, men....its a huge pvc pipe that just goes from a huge opening and. Bottlenecks back to about a 75ish mm opening at the throttle body which to me seems utterly pointless to have such a huge tube filled with a ton of air that has to bottle neck back to a smaller opening....plus the fact that jlt just used Pcv pipe....pretty lame to me to spend a ton of money on Pcv..
My thoughts would be tuner and gears....best performance gain for the car right there