What is your goal? If it is to go faster, ain't gonna happen. If it is to make more noise, might happen a little. If it is to waste your money, spot on.
make it more drive-able. Reading mixed reviews upgrading the 1.8. Some people say its worth it some people say its not. I planned on doing a CAI and a Tune.
I have a 2016 Limited and am having the same results searching for a CAI. Looking to bump the MPG by a gallon or two. I think I am going to custom build my own this month.
Have you considered the drop-in the- airbox K&N filter? I always had a better response in my other cars too, including a subaru legacy and my old Pontiac Grand Prix. And I did try various air intakes for all of them. The drop-in filter was always the most economical and the best result (money vs gain ratio).