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Check Engine Light

Engine

Model: 993, Year:1997, Mileage:62000, Type of use:Street use only
I changed out my exhaust system (stock) to a fabspeed RS headers, sport cats with Techart performance mufflers. For a 1 1/2 years it ran without any issues. The check engine light recently came on. Diagnosis codes pointed to the high flow cats.. didnt appear to be any issues with exhaust ports.The shop is recommending an ECU flash. I am hesitant to do this without getting some insight and advice on how best to proceed. if a flash is a good recommendation, what companies would you recommend.thanks,Tony

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