I don't understand the "burns away" part. Since the buildup is on the intake valves, where is the heat coming from to burn it away?I have used it; you have to introduce the spray after the turbo. I use the port on my symposer delete. Not as good as manual cleaning the valves, but much better than no cleaning at all. I could see it damaging the turbo if huge chunks of carbon came flying off of ridiculously caked valves, but it more or less softens the carbon so it dissolves and burns away.