Our Stage 2 Power Package utilizes the maximum potential of your factory VF39 turbocharger and delivers an astonishing 365HP and 375TQ with only minor modifications.   

First your heavy factory crank pulley is swapped in favor of the Gruppe-S lightened crank pulley.  Our crank pulley weights substantially less than the factory unit and reduces rotating mass without under-driving your engine.  The result is performance gains in power as well as response.  Because of the compact design of the EJ25 crankshaft, there is no risk of excessive vibration or reducing the life of your engine. 

The next step is to recalibrate your engine parameters to maximize the effectiveness of our Stage 1 components.  This is achieved through the use of the Cobb Access Port, an advanced device that is able to reprogram your ECU while offering multi-map switching capabilities.  We pre-load your Cobb-Access Port with our Gruppe-S Stage 2 map, which with our years of high-performance tuning experience, modifies your boost, fuel, and ignition parameters to achieve substantial performance gains.  Also eliminated are emission control parameters such as the open-loop delay which can in fact cause detonation on a modified STI.  All stock ECU safety parameters including the intelligent ignition / knock control are retained for maximum driveability and safety. 

The excess power requires additional fuel, and the Walbro GS342 fuel pump is tasked to deliver the additional fuel needed for our Power Package #2