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I have a pacesetter header on my car and have been having 02 sensor problems. The codes that the car gives are a slow o2 read on the first o2. I am wondering if I need a aftermarket o2 sensor to make up for the difference in flow so I will not get a service engine light? Because the pacesetter has a 3 inch collector and if I am right our cars stock is 2 inch. Any input will be appriceated.
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