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As it stands, the Marauder comes with a pair of log-style cast-iron manifolds. These feed into a double Y-pipe with a crossover tube. From the factory, this Y-pipe is 2 1/2 inches in diameter but incorporates four catalytic converters: two pre cats right up by the manifold flanges and two cats downstream. The end of each converter is actually 2 1/4 inches across, and although the system works reasonably well, it hinders flow, especially considering that the four-cam engine really likes to breathe.