Variable suction enables well-modulated sound between a factory suction and Racing Suction. GT SUCTION is a variable intake system to suit driving conditions. Butterfly valve is operated by a vacuum actuator for reliable and accurate control. The EVC-GT controls valve opening between 1000-5500rpm. By setting the valve programming correctly, performance is equivalent to Racing Suction. Valve holder is included for simply and tidy mounting. EVC-GT installation harness is available separately.