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ASR Klappensteuerung RX1 Audi RS4 RS5 B9 Facelift 640i Increase the power of yourASR Audi RS4 [B9 8W Facelift] flap control RX1 Control via handheld transmitter Plug & Play installation directly on the flaps Not approved under German road traffic regulations. For racing, show, or export use only. With our valve control for your Audi RS4 [B9 8W Facelift], you have the option of manually operating the exhaust flaps. It's controlled using a handheld transmitter, giving you complete control over your vehicle's sound! 1 Sport Mode The