With the KUFATEC Exhaust Pro you have full control over the behavior of the exhaust system Suitable for Audi S3 8V Audi RS3 8V Audi TTRS 8S Audi TT 8S with engine code CHHC (169 KW) Control is carried out using the smartphone app "KUFATEC Link" KUFATEC Link is available free of charge on Google Play and Apple App Store ESP button (3x click) optional radio 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 reset Visualization of the following information Damper position (open / closed) Engine speed Accelerator pedal position Actual vehicle speed Operating status of the module: Series: The dampers behave as at the factory Open: The flaps are permanently open Closed: The dampers are permanently closed, but open when the force exerted on the pedal is > 70% or when the engine speed is above 4,500 rpm Scope of delivery: Plug & play cable set module Note: This product is not approved for use on public roads - use for racing purposes only. Sales are only made outside Germany