GFB VTA BOV 2013+ Audi 1.2L/1.4L TFSI/TSIThese engines come from the factory with no diverter valve of any kind, resulting in turbo compressor surge every time the throttle is closed after boosting., , The intake is acoustically tuned to surpress the fluttering sound of compressor surge, it does not eliminate the effect of pressure pulses that is what diverter and Blow off valves were originally designed to do., , The GFB T9430 re introduces a blow off valve into the 1. 2 1. 4 TSI system,