Choose the model of the Audi S4 2003-b6 you are working on and see the expected performance gains. Even though you will be pleasantly surprised by how faster your Audi S4 2003-b6 can be, you will also enjoy complete safety.
GT KRAFT IS THE BEST CHOICE FOR YOUR CUSTOMERS
Fast file service for stage 1 & 2
Pop & Bang, stage 3, and 4 projects
Deletes GPF/ OPF / PPF / DPF / EGR / Adblue / DTC and more
Dyno developed calibrations
Gearbox/TCU tuning specialized for BMW, Audi, Porsche, Volkswagen, and many other brands