Just thought i would share my experience. I had read numerous threads etc on various sites regarding the problems associate with Carbon Build up, not just in the R8 but throughout the FSi range. Anyway i was shocked at the state, the pictures do not show it as best as i would like but it was significant, there was visible sludge etc and the valves were barely visible. The car is noticeably better driving and feels a lot more responsive. Anyone with the FSi engine i would advise to consider this before any further mods.