I thought you had to be very careful with tyres on a Quattro - I was (perhaps mistakenly) under the impression that you should replace all tyres at once, and rotate them around the car so they wear evenly. If one axle set is worn and the other is new then you get too much relative speed difference between the axles, and it causes premature wear to the Quattro system. I thought I'd read this in the handbook, but I might be imagining it. Anyway, I've got Continental Sport Contacts on my A6 Quattro and my wife has them on her Saab. I've always been impressed with the level of grip in the wet and their life seems to be substantial, but it's an interesting comment about the higher noise levels, Martin. I've always fitted cheapo tyres to my old Mercedes E Class, and the difference in grip level between the Merc and the Audi is shocking. I drove the Merc this week for the first time in 9 months, and it understeered on a roundabout really easily compared with the Audi. Decent tyres are definitely worth the difference. Again Martin, thanks for the updates. Your story threads are very useful!