Airtec Big Boost Pipe Kit - for Stage 3 Airtec Intercooler - GR Yaris Gen1Airtec Motorsport Big Boost Pipe Kit for Stage 3 Intercooler for GR Yaris Gen1 A direct replacement kit that offers increases in performance and response, the enlarged boost pipe kit features a freer flowing design with a increased internal diameter on both the hot side and cold side. With an enlarged cold side design that increases the pipe diameter by 50% to allow fitment to our Stage 3 intercooler with 60mm inlet, making it ideal for cars fitted