Unitronic Supercharger Pulley Kit - Audi S4 / S5 / A6 / A7 / SQ5 3.0TFSI 2010-2018For Clients interested in upgrading their vehicle equipped with the 3. 0TFSI engine Unitronic's 58. 3mm Supercharger Pulley Upgrade effectively raises boost levels by increasing the speed in which the supercharger spins at allowing for additional airflow to be ingested by the engine. Unitronic has developed corresponding Stage 2+ Performance Software for use with its Supercharger Pulley Upgrade which helps produce a maximum of 451HP 388LB FT. (sold