Had my 2005 duramax cleaned by Richard and gottta say: wow! Truck has never ran so good. The process cleaned the turbo and the motor is way more responsive and quieter. Had a turbo sensor code before the process and after it cleared. Now gonna have my BMW cleaned too. I recommend this to everyone. Also Richard is awesome! Honest, reliable and knowledgeable. 5 star customer service. What a great company!!!!