This is Stefan's RS4. He just purchased it last week, it came in for a set of new spark plugs, new fuel filter, brake fluid flush as well as a carbon cleaning service. At 85K miles it definitely needed to be cleaned! Here's a short video during the process & soaking stage. If you'd like to have this done to your RS4 feel free to contact us at sales@elitemotorsport.net or my direct email!