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Headers are considered the cat-forward part of the exhaust system. The rest of the system is called after-cat, although high-flow catalytic converters like this one from BBK Performance can be installed. This Y-pipe removes the blockage caused by the factory crossover pipe.
A Guide To Ford F-150 Pickups

 Headers are considered the cat-forward part of the exhaust system. The rest of the system is called after-cat, although high-flow catalytic converters like this one from BBK Performance can be installed. This Y-pipe removes the blockage caused by the factory crossover pipe.  View Related Article

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