Goodyear Eagle F1 GSD3, 225/40 R18 Y
That's the tyres I've got on all 4 wheels. Driving through water no longer makes you wish you'd slowed down more.
Torrential downpours on the A34 a week ago and traffic moving at 40-50mph. my tyres allowed me to zip straight past at 60-70mph. Never missed a beat and never at all felt like the car was going to lose grip.
Grips is fantastic in both wet and dry. Tyres wear pretty well and generally I have to say the best tyre ever for an S3. Highly recommended.
Blackcircles.com - shameless plug. Almost 50% cheaper than my local garages were offering me. Price is all inclusive including fitting and balancing. I paid £235.00 per pair and I thought that was a bargain. Couldn't find them cheaper anywhere else and I got them fitted the next day.