I changed the sparkplugs this evening. Put in NGK Iridiums BKR6EIX. The original ones looked like the NGK Is, but with Audi 4 rings on the insulator. They were dry, no oil, grey ish in colour. The tip is about half worn compared to the new ones. Does it mean that I need to put in cooler plugs ? Also I had to take off a small black box that was obscuring the 3rd and 4th coilpack, that doesn't look like it's doing much, it has a pipe coming out of it and connects to a rat's nest of pipes connected to a electrically operated valve. Whats the black box for ? Valve ? Is it for emissions ? Is it part of the EGR ? Can it be removed ? Also I broke the clip on the coil pack connector :-( I reckon they're made from Jacob's finest. It was well worth changing the plugs, much smoother. Car is slightly faster, but that might be the cool night air though.