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Cat-back (also cat back and catback) refers to the portion of the exhaust system from the outlet of the catalytic converter to the final vent to open air. This generally includes the pipe from the converter to the muffler, the muffler, and the final length of pipe to open air.
They are designed to generate back pressure, to reduce exhaust noise and emissions. In contrast, a performance cat-back system is designed to maximize engine efficiency. By utilizing larger piping and high-flow mufflers, a performance cat-back exhaust reduces back pressure and thus improves horsepower.Furthermore, since the engine is able to more easily expel exhaust gasses through the larger piping, a performance cat-back exhaust slightly improves fuel efficiency.ave. There are numerous benefits of a high-flow, catalytic converter-back exhaust system. Foremost, an aftermarket cat-back exhaust increases both the horsepower and fuel efficiency of your engine.