I have a Chevrolet dealership and my certified technicians installed these cats on a truss. The installation went great and the car passed all diagnostic checks when the job was done. After 5 months the customer returned and after diagnosis we found that the car's computer was not reading the cat information efficiently and the O2 sensors were not getting correct readings due to the reduced flow. With absolute certainty these cats are a problem. I will NEVER buy these again.
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