Inlet Hose 3" with Nozzle 15-19 WRX RedPSP INT 424RD OVERVIEW The PERRIN Turbo Inlet Hose for the 2015 2019 WRX will increase airflow to the engine which increases horsepower while adding a touch of color and style to your engine bay. NO TUNING REQUIRED! WHY YOU NEED THIS The plastic intake manifold constantly flexes under normal driving conditions. Over time, the flange will compress and deform causing vacuum leaks at the turbo. This leads to dangerous engine conditions and check engine