Perrin Charge Pipe for 2015-2019 Subaru WRXImprove the air flow in your vehicle with the PERRIN Charge Pipe. The OEM charge pipe for your application is restrictive and the design narrows down in certain areas which creates uneven airflow. The PERRIN design combines smooth bends with a smooth interior with a larger piping diameter that creates better intercooler efficiency. This charge pipe will come with all the necessary connectors to install onto the stock system for greater compatibility.