Got my chip for my A6 2.7T 6SpdMT from APR tuning. Love the way it drives and big improvement over stock. Since yours is tip, i would recomend a trans chip too. Check out Goapr.com

2000 Audi A6 2.7 Biturbo 6 spd manual.
Mods: APR 93 octane chip, stock/upgrade modes, Dual LLtek diverter/blow-off valves, LLtek cold air intake, B&M short shift kit (49% reduction), Koni three way adjustable shocks, H&R sport springs, BBS RK 17x8 rims, Bridgestone Potenza SO-3 Pole Position (235/45-17) tires, DiscItalia drilled/slotted front rotors, Rotex street/race pads, rear Brembo OEM replacement rotors, ceramic pads, StopTech steel braided brake lines, AWE tuning racing brake fluid, DubStop badgless front grill, Samco silicone throttle body boot.