I am not affiliated with this company in any way, shape, or form. But seems like it could help with many carbon and LSPI issues of the Direct Injection engines. I may be overlooking something though, so feel free to post your opinions and facts on whether this is a good/bad idea and why.
-Reduced valve-to-seat wear
-Eliminate sticking valves; quieter valve train
-Removal of carbon deposits which cause pre-ignition
-Protection of valve stems, guides, seats, rings, and cylinder bores
-Increased compression, power, efficiency and engine life!
From their website:Expect These Benefits
-Increase in fuel economy by reducing friction-Reduced valve-to-seat wear
-Eliminate sticking valves; quieter valve train
-Removal of carbon deposits which cause pre-ignition
-Protection of valve stems, guides, seats, rings, and cylinder bores
-Increased compression, power, efficiency and engine life!