This section is mainly for the main catalytic convertor; please check out
our Pre-Cat section for reference on the pre-catalytic convertor.
Not too many aftermarket main cat replacements are available that
will last as long as the stock unit, unfortunately.  Most units
only last a couple years at the most from what we've seen.  A couple
of very high quality units are made by MindTrain and
Most high-performance applications eliminate the main cat and run
either a straight pipe or a pre-silencer in place of the main cat.
This allows a freer flowing exhaust path.  The pre-silencer is
nothing more than a straight-through muffler, which reduces the
A high-flow cat can gain you up to 2psi of boost.
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