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Originally Posted by bmwm750
Fabspeed does make some good stuff. The real issue of debate here, as far as I know, is that differing years of Boxsters have 02 sensors after the 2nd cats and some dont. If your car has Lambda sensors after the 2nd cats, and you remove them, yes the ECU is going to be pissed off.
Patrick
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Patrick, 97-99 boxsters only have one pair of cats. 2000+ boxsters have two pairs of cats. One set of pre-cats on the exhaust manifold and one set of main cats further down stream by the muffler. The Lamda sensors on the 2000+ cars are just fore and aft of the pre-cats. The Fabspeed bypass pipes and similar systems out there just elimate the main cats further down stream that contain no lamda/O2 sensors which is why they claim no CEL issues.