The AMS Mitsubishi Evolution VII/VIII/IX Upper Intercooler Pipe is a replacement for the factory cold side piping. It completely replaces all of the factory pieces from the IC outlet coupler to the throttle body. Through their extensive parts prototyping and dyno testing programs they have found that replacing the upper pipe will free up additional horsepower and boost response.
Due to the improved non factory routing, this kit requires the use of the AMS small battery kit and is not compatible with the factory air box.
If you are planning to use your stock bypass valve you will have to extend your factory return tube that goes to your intake.