Brother-in-law drives a B5 as well ('02). I'll need to ask if he's modded it or not.
AFAIK, he was stock when I drove it around. Speedy, but definitely stock not as fast as a Z. Tune it a bit though - hmmm...
Definitely a nice ride - I've been egging him on to upgrading to a later model, but they're wicked expensive!
Of course, his Audi's in the shop right now...
(Hehe, don't worry - it's body work being done... engine's fine!)