Frequency Intelligent Exhaust is a manufacturer of high performance valvetronic exhaust systems for sports cars and supercars. Switch between Street and Race sound profiles using our Fi Pro remote control, mobile App or OEM drive modes for selected models. All Fi EXHAUST systems come with the valvetronic technology as standard. Fi intelligent ECU system can detect the engine's RPM/Speed/Turbo boost to automatically switch between valve modes in order to provide the best performance output and sound note. Fi EXHAUST provides users with more personalization options based on driving habits and a unique, rigorously tested twin sound system.