Eventuri GR Corolla Carbon Intake SystemPerformance Increase on Mustang Dyno : 15 17hp, 15 18ft lb The GR Corolla Intake follows on from our GR Yaris system which was developed through extensive data logging of temperatures, flow rates and dyno testing. Since this is a turbocharged engine, heat and volume were the main considerations during development. This intake system has been developed to offer the highest possible flow rate whilst maintaining the lowest intake temperatures possible.