Acoustic Control Induction System, or ACIS, is an implementation of a Variable Length Intake Manifold system designed by Toyota. Simply put, the ACIS system uses a single intake air control valve located in the intake to vary the length of the intake tract in order to optimize power and torque, as well as provide better fuel efficiency and reduce intake "roar". Applications: * 5E-FHE * 1G-FE (VVT-i) * 1GZ-FE * 2JZ-GE * 7M-GE * 3S-GE * 1S-iLu * 1MZ-FE * 3UR-FE * 1UZ-FE (VVT-i) * 3VZ-FE