Phase 2 in tuning a PITA IKCOS series ROM . Highly recommended to get the dealer to upgrade your car's software though.
Phase 2 was smoothening out wastegaste activity during WOT. With stock downpipes and the backpressure being face with I finally got them stable at current boost levels
http://www.datazap.me/u/buraq/e89-z4...-9-10-11-16-21