I just had these fitted to my S3:
Specialist in performance parts for the VW Audi Seat Skoda Group cars. Interest free finance available on all car tuning parts and we have our fully equipped specialist workshop in Manchester.
www.awesomegti.com
I had H&R 25mm springs and standard shocks before. Front right shock absorber was identified as damaged during MOT and couldn't get any Bilstein dampers in time (was planning on getting B8s), there's a major backlog on suspension parts at the moment due to a global shortage of steel I believe.
So went for these coilovers which were recommended by the guys at Awesome GTI. Was avoiding coilovers for fear that they would be too harsh but honestly the transformation in the ride is night and day. It's more comfortable than stock or the H&Rs, is firm over bumps but not excessively so, feels planted and is a pleasure to drive. These are made by KW, same as the ST-X in terms of rebound and damping but are their cheaper brand but really don't skimp on the quality. Would highly recommend getting these fitted to anyone wanting to improve the S3 stock suspension without spending a fortune. Awesome GTI will fit them for £199 Inc vat, which includes full geometry, 4 wheel alignment and tracking. Highly recommended for normal/fast road use.
If you're wanting to track the car then you'd either want to get something more track focused like the KWv1s/v2s, or supplement these AP Coilovers with H&R anti-roll bars, an anti lift kit and adjustable drop links and new bushes - stuff that you'd probably want to do anyway regardless of which coilovers or spring/dampers you go for if you want to track it or improve the handling and kill the understeer although having these things fitted will make it firmer I believe.