The harness I have with it supplied is for the Audi S4 B9, makes a great difference to the car adds a lot more HP and torque and has different settings via a Bluetooth app. It is a great bit of kit, there is a WhatsApp group aswell with people from all different countries who have the box I can add anyone too that has good info and DTUK owner is in the group too for any help, I’m only selling because I’m changing car,