Back before I got my Z and I was interested in Audi's I did a little research of my own. When I got my Z and went back to the forum to see what would give me that beautiful blue/purple look the guys responded with optics. I've seen people with A4's that buy the Phillips HID kit and instal it on their projectors and it looks WAY better than on the Z. I am almost positive that the projector lens on an A4 is slightly bigger than on the A6. and if any of you have gone head on or have had an A6 behind you, you almost want to shiet when you see how blue/purple they are. OPTICS is where it is at to make the kit more efficient. I like my kit just fine though.
"Do not allow yourself to get attached to anything that you cannot walk out of in 30 seconds flat when you spot the heat coming around the corner"