Unitronic Stg.3 Big Turbo Software for your B6 Audi A4 1.8T is customed tuned to your personal big turbo setup. This software requires the use of either 630cc, 830cc, or 1200cc w/ a wire in injector box. The Stg.3 Big Turbo software is capable of 300whp all the way to 600+whp! Power output depends on your specific turbo setup. The price of the software includes the $65 shipping fee.