Dump Valve - Kompact EM Dual Port - Turbosmart - GR YarisDual Port Loudest version Note: This can cause stalling issues on some cars with standard ecus. The momentary over fuelling on over run can cause the engine speed to drop low enough for it to cut out. No issues on Syvecs & Motec cars not relying on the airflow meter. The award winning Kompact EM series Blow Off Valves, are the worlds first truly plug and play Blow Off Valves. Simply unplug and unbolt your OEM Blow Off Valve, and install ours in its