The FC3S turbo runs two catalytic converters.  The first cat is the pre-catalytic converter, or pre-cat.  This pre-cat is strictly used to suppress cold-start emissions.  This pre-cat is prone to failing - if the pre-cat fails, it disintegrates and clogs the main catalytic converter.  Strictly as a maintenance precaution, we recommend replacing the pre-cat with a tubular downpipe.

Note, for those who need to adhere strict emissions laws (i.e. state of California smog tests), this modifiction will not pass a thorough, visual emissions inspection.  Tampering with a good, working automotive emissions system is in violation of federal laws.

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