HKS Exhaust System - High Power Spec L II - GR YarisHKS Exhaust System High Power Spec L II for GR Yaris HKS lightweight exhaust design has reduced the system weight by 25% over the stock exhaust system. The low exhaust pressure design is capable of high exhaust flow and a great sound. Cabin noise is reduced by using a silent chamber. GR Yaris Features: Main material is high quality stainless steel SUS304 65mm centre pipe and 2 x 50. 8mm rear silencer pipe diameter 94mm tailpipes Silent chamber to