2016 doesn't use H9. It uses H11b for lows and H7 for high's. The lows are also projectors so no problem with HID's.You can only do so much with the factory halogen projector. It'll always leave something to be desired no matter what you drop in. An H9 bulb would be your best bet with up to a 90% increase in light output. The reflector bowl was designed for a halogen bulb and dropping in an HID kit will lead to a burnt bowl and worse output caused by the UV lighting put off by the HID bulbs. Stick with halogen.
Without opening your headlights, an H9 bulb swap is the best thing you can do to improve your output.
Now if you're up for opening, there are a couple options. I was messing with a clear lens swap and some fine tuning on a factory KDM projector (hence the step). Here's what I was able to achieve with the factory halogen bulb. Nice sharp cutoff with blues and purple as well as a more intense hotspot. Swapping to an H9 bulb would yield better results.
I also have brackets that make any mini H1 projector a direct bolt in to the factory assembly. No modification necessary. This allows you to PROPERLY run an HID setup without the fear of damaging the bowl. The new projectors are also bi-xenon which means it will also function as your high beam. With your factory halogen high beams and these projectors, you will have 4 high beams lighting your way. This is the best possible modification (currently ) you can do to your headlights to improve your night vision. Example of Mini H1 projectors installed in a Veloster headlight below.
-Swap to an H9. Don't run HIDs. Potential to ruin your headlights.
-Clear lens swap can lead to better output with the factory projector.
-Brackets available to swap out the projector for a proper bi-xenon setup.