Just some info:
I've been trying to get a stiffer and adjustable rear anti-roll bar for months for the S3. But with no luck.
Forge - tried to make some, but the manual bending process wasn't accurate enough. The cost of investing in proper equipment out weighed demand.
Eibach - don't do one.
Abt - Do a stiffer anti-roll bar. Spotted on German site. But on ringing Abt Sportsline UK, they say that anti-roll bar is only suitable for with their lowered suspension. [img]/ubbthreads/images/graemlins/frown.gif[/img]
So, it would seem, the only cure for the S3's understeer is completely new suspension setup [which I can't afford [img]/ubbthreads/images/graemlins/frown.gif[/img] ]