Audi S6 Downpipes

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	Milltek Downpipes with High Flow Cats Audi S6 4.2 Quattro 98-04 Model Number: SSXAU098 View Price Your original catalytic converter will typically have 400 or 600 cells per square inch (cpsi), these original cats are restrictive in their flow, typically allowing an open area of around 55-65%. A Milltek Sport Hi-flow Sports Cat which will be fully integrated into a large bore downpipe, has only 100-200 cpsi depending on application. These cats have an open area of between 75-85%, thus reducing back pressure substantially and increasing flow rates, all very desirable for extracting more perfor...