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I just bought a 2003 Tib GT that was straightpiped and doesn't have a CEL on. Is it possible my ECU was flashed and I need it flashed back to stock? Or can I just throw a universal cat (needs to be CARB compliant, unfortunately) in and it'll be okay?
 

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Are just the resonator and mufflers deleted or does it have aftermarket headers? 03's are less sensitive and sometimes won't throw a CEL so you should be good. Unlikely it was flashed there really aren't any.
 

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There's no o2 sensor after the main cat so the ecu doesn't know whether or not its there. How does it sound? Was considering doing a cat delete
 

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If your in California you'll have to get a stock 3rd cat and a carb compliant cat back. Unless you find a lazy or bribable e test station.
 
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