So I just found out (in a real shitty way) that my car is an 03, but with an 04 transmission and engine. You would think that they are COMPLETELY identical. No. I ordered another silver intake because mine was slightly warped and the dam thing doesn't fit! It's shaped almost identical except for a smaller cut down the side and its slightly larger overall, the 03 version is a lot "weaker". After cutting it a little bit and forcing it in everything fit, but I had to investigate. (btw this is OEM straight from Audi) The 03 air intake (silver duct) is larger and isn't heat treated. The official note attached to the part number (when comparing the O3 and O4) says that the o3 is for *NOT HOT CLIMATES* while the o4 says *for extremely hot climates*. heres the kicker. 03 intake 60 bucks, 04 = 130. Just thought I would share this with the RS6 gurus.