SST Valve Controller for BMW G80 M3 G82 M4 G87 M2SST Valve Controller for BMW G80 M3 G82 M4 G87 M2 Part # SSTG8X SST Valve Controller for BMW G80 M3 G82 M4 SSTG8X SST exhaust flap valve control suitable for BMW 3series M3 Type F80 G80 G81 YOC from 2014 This plug and play control unit gives you the option to open or close the exhaust flaps as you wish. The control unit works without any problems with the standard exhaust system. The effect is even stronger in combination with a sports exhaust system.