You will be severely disappointed with the power and the reliability...
HA! Downpipes and a tune or everything I've had to do to this C5 to "hopefully" come close to those ET's LOL
I'll take my chances on the S8.
BB GT28's w/ Tial Wastegates, Full 3" Open Exhaust, Wagners, Billet Triple Disk Converter, Built Trans, Exedy Friction Disks, ECU/TCU Tuned, 450/AEM400/1000cc/AFPR, E85, R8 Coils, Nubcake Tuned. Fastest RS6 in the USA :)