Below is the reply TRS (the retrofit source) gave me in regards to the sonata sport.
"Hello Justin,
Thanks for getting back to us! The most important information we'll need is going to come down to which of those two bulb types you have. Since you mentioned it was a halogen setup though you would have to have the 9005 option, since the D3S bulb type is a HID bulb. Admittedly since this is such a new vehicle, and one we don't have much feedback on, i'll just have to make my recommendation based on what those vehicles usually take. I can't say with any certainty if the kit will require a bit of an above and beyond wiring scenario, but it should work fine.
If you're just after an HID system and not wanting to open the seal of the headlights for a projector retrofit, I recommend the 9005 Elite HID system:
9005: Morimoto Elite HID System - HID Systems from The Retrofit Source Inc.
You'll see many options here, so don't get too overwhelmed just yet. I'll cover each option below:
Ballast options: You have your choice of 35w (3Five) and 50w (5Five). All OEM HID systems are 35w, so this is the tried and true option. It comes with a five year warranty and produces approximately three times the light of your stock setup. The optional 50w (5Five) ballasts are going to give you about 25% more light over the 35w system, but at a shorter lifespan. Because of the shorter lifespan, the warranty is also reduced to three years instead of five.
Bulb options: We're still getting situated in our new facility to have very accurate color examples, but it's quite simple to cover in words in the interim:
4300K - OEM bulb color. The brightest of the three. Warm white / almost yellowish hue when new.
5000K - Slightly dimmer and slightly bluer than 4300K. Fluorescent (pure) white in color.
6000K - Slightly dimmer and slightly bluer again than 5000K. Light blue in color.
Wire harness: For your car, we recommend the HD relay Harness for proper functionality and performance, but you'll also need to order the capacitor link for the system to function properly. You can find that capacitor link here: http://www.theretrofitsource.com/accessories/capacitor-relay-harness-link.html#.VDRYbyldVH0"
rdef1, could that capacitor link be your missing piece?