In the ADS workshop we have my favorite car the B7 RS4 in my humble opinion the best looking 4 door family saloon car ever built. As well documented suffers terribly from engine carbon build up due to FSI engine design which i njects fule directly into the combustion chamber meaning the fuel is no sprayed onto back of the inlet valve which also acts as a cleaner. The result of this causes a huge build up of carbon on the valves and seats contributing to a significant loss in engine power and smoothness.
Over the years we have tried and tested several methods and chemicals in removing the carbon but none better than the Tunap kit which utilities polymer bead technology which blasts away the carbon and is safely and eco friendly dissolved with special rinse agent after wards. See the pictures below for before and after results.
As the results show the stubborn carbon has been completely removed and has left the inlet ports spotless which has restored all the lost power !!!