Another mod from ASN that seems to be popular with the A4 drivers, is fitting an RS4 rear anti-roll bar to stiffen up the rear end.
Part Numbers required are:
8E0 511 409 AL - Rear Stabilizer Bar
8E0 511 327 A - bushes x2
8E0 511 439 - clips x2
From what I can find out, the parts come...