HKS | Intercooler Piping Kit | Toyota GR Yaris | G16E-GTS | 2021+To accommodate higher output, the diameter has been enlarged from the stock diameter of 45 to 50. In addition, the layout has been designed to minimise bending, reducing pressure loss. By replacing the parts where the stock hose is prone to coming loose with our aluminium pipes, the piping remains secured while driving. A 3 cylinder engine is subject to a lot of vibration, so we used a 4 ply silicone hose to achieve high pressure resistance and