Airtec Big Boost Pipe Kit - Stage 1 Intercooler - GR Yaris Gen1 & GR CorollaAirtec Motorsport Big Boost Pipe Kit for GR Yaris Gen1 & GR Corolla with Airtec Stage 1 Intercooler A direct replacement kit that offers increases in performance and response, the enlarged boost pipe kit features a free flowing design with a increased internal diameter on both the hot side and cold side. Note: for Airtec Stage 1 Intercooler. does not fit oem intercooler. Features: Up to 39% increase in bore size Larger and freer flowing design