I'm aware of and understand the carbon buildup on the rear of the intake valves on GDI engines. Being conscious of this, I've been looking into the issue and read about the CRC Intake Valve and Turbo Cleaner that can be used to remove carbon I wonder if it really works and could be used as a preventative measure to prevent the carbon buildup issue. I'm wondering if anyone has any personal information on this product. Does it really work, is there any negative effects that it can cause, is it just a over-hyped scam? If anyone has additional information on this, please enlighten me. I'd be using it more as a preventative measure at this point on my 2019 3.3l v6 Sorento.