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The CEL's can be eliminated in my application ('02 Boxster S) with a reprogramming of the ECU. Basically, you program it has as a Euro spec. car which is only looking for a signal from the front O2 sensor (on the first cat.) and not both front and rear sensors. This set of headers only has one O2 bung which is good for my application as I don't have to add one or block of an extra one.
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