With the KUFATEC Exhaust Pro you have full control over the behavior of the exhaust system Compatible with Audi S6/RS6 4G Audi S7/RS7 4G Control is carried out via the smartphone app "KUFATEC Link" KUFATEC Link is available free of charge on Google Play and Apple App Store ESP button (3x click) optional remote control The following functions are available in the "KUFATEC Link": General diagnostics with CAN packet counter Pin protection Incognito mode (the module is completely invisible after the set time) Software updates over the air Factory settings Visualization of the following information Flap position (open / closed) Engine speed Accelerator position Actual vehicle speed Operating status of the module: Stock: Flaps behave as factory Open: Flaps are permanently open Closed: Flaps are permanently closed; but open when pedal demand is >70% or engine speed is above 4500 rpm Scope of delivery: Module Wiring harness Note: This product is not approved for use on public roads - for racing purposes only. Sales are only made outside Germany