RS ZN6/ZC6 86/BRZ FA2070020 AT115 FEATURE You can have strong power in the high RPM and better response from open and close of throttle with air flow adapter casting short suction pipe and heat insulator. You don't need sound creator. The direct sound from the engine is good enough. We have stabilized the intake air temperature by shutting off the hot air from the radiator and set the cooler for fresh air with a shroud. COMPARISON DATA Impression Stock Bad 1 2 3 4 5 Good