I had bought my Q50 10 days ago. Since the dealer didn't have a car with options I wanted in the inventory I decided to pay for the upgrades. When I've seen the prices for installation I had decided just to buy the parts and install it myself. Somewhere in this forum someone said "Why to pay $200 for ambient kit when you can buy LED's on net and pop them in. Well, the car is pre-wired but just not all the way and the kits contain lots of wire harness to be installed. It partially justify the price of installation. I bought: Rear and front splashguards, Ambient light kit, Illuminated kick plates and Interior welcome lights. The labor to install was around $600 so I declined the installation. Today I picked up the parts and it is lots of wiring. But it came with the link to installation website which (I think) will help other members. Here it is and good luck.