Great looking car, love the blue.
A K&N CAI is one option, and it will work well with a Trifecta tune if you go that route. K&N may offer a rebate, too
https://www.airflowrebates.com/
or the Injen short ram intake, although I am not a fan of the chrome pipe
Injen Short Ram Intake Chevy Sonic 1.8
stay away from the cheap alternatives on Ebay and Amazon. I had one on a Saturn that completely failed, allowing unfiltered air directly into the engine
just some food for thought...
opcorn: perhaps the K&N and CAI's in general do not offer the best protection and filtration for your engine
https://www.bobistheoilguy.com/forums/ubbthreads.php/topics/4932835/keep-k-n-or-not#Post4932835
re suspension options, check out the GM kit at a great price
Sonic Lowering Kit Rs Models 23158162
and a review of the kit by Mark Vaughn (near the bottom of the page)
https://autoweek.com/article/car-reviews/2017-chevrolet-sonic-rs-drive-review