When looking, also check the 2016 scion IM. Most items are the same.
So far for intake system these are available for the 2016 Scion IM and 2017-2018 Corolla IM.
1: TRD Cold Air Intake System
2: AEM Cold Air Intake System
3: Weapon-R Short Ram Intake System
4: Injen SP Series Cold Air Intake System
I have a 2017 Corolla IM, as well as the TRD Intake from Toyota. Reasons why; doesn't void warranty, especially when Toyota installs it. Also is designed to work best with our engines.
Keep in mind, we don't have a ton of Horsepower or Torque, therefor one of these systems will make you gain .5-2 HP, if lucky.