Been a long time since I updated this thread.
I recently bought an 01.5 S4 Avant, currently down for turbo replacement, but I absolutely love the thing. Bought it basically stock (had a flash and gutted cats), now it's got a full SSAC turbo back exhaust, BC Racing coilovers with custom rates, and a few little misc mods here to increase awareness VEI digital boost gauge, hardwired V1, etc. Can't wait to make more progress on the thing.