Where is the vacuum piston and shaft of 1989 mr2?

In the 1989 Toyota MR2, the vacuum piston and shaft are located within the intake manifold assembly. The vacuum piston is part of the air intake system, which helps regulate air flow into the engine. It is typically connected to the throttle body and works in conjunction with the engine's vacuum to control various functions, such as the operation of the wastegate in turbocharged models. If you're looking for specific parts, it's advisable to consult the vehicle's service manual for detailed diagrams and locations.