Over 35 years I've been a "Gung-Ho" Porsche owner (of both water and air-cooled Porsches), a Porsche Club member, and a Driver's Education instructor. I speak from experience when I say that many factory Porsches and other cars will have their OEM CATALYTIC CONVERTERS FAIL or BREAK DOWN after street driving or brief track usage in racing or drivers’ education events. Even …
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