It already had the tyres! .... Been through PS2s,PS3s,F1Assys,R1Rs and so on...
Mine's been modified through Stg1 all the way to Stg4,and we did the ARBs and suspension first,with kW v3 coilovers.
As the power went up,the brakes were changed as well,to a VWRacing kit(which has been modified further),and the Haldex controller added.
For a Stg2+ car,that's probably more than you'll ever need,but as we added a bit more power,the remaining understeer was still a problem,highlighted at AMD's trackday last year,so the final round of mods came in.
kW Clubsport suspension with adjustable topmounts,Team Dynamics 1.2 rims and 245x40x18 R888 tyres.
That's all on my build thread here....
http://www.audi-sport.net/vb/a3-s3-sportback-8p-chassis/106134-time-build-thread-big-turbo.html