No really, it does a great job. I was always questioned it untill we went to a class for it for training. They brought in one of the managers car, some old F150 and ran it through the cleaning. Pieces of carbon were coming out of the tail pipe, as well as a lot of smoke. My store manager had it doen to his car and he really has noticed some improvment in performance. My brother had it done to his car, my dad is coming into day to get it done, and Ill probably take my mom's car to have it done to hers.
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2/20/2013: They Day the ****s Stopped
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