2005 Pontiac Gto Factory Exhaust System
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This is the factory exhaust. While the 2.5-inch-diameter pipe supports a lot of power, the horsepower-robbing catalytic converters won't. They'll be replaced with high-flow metallic substrate cats. Regardless of the presence of catalytic converters, long-tube headers aren't emissions legal. Cats can be used to reduce noise levels. View Related Article
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