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The Mercedes-AMG C63 and C63 S are the cars that made the M177 4.0-liter twin-turbo V8 a legend. The W205 generation delivered a perfect balance of daily usability and raw performance — and with the right modifications, it becomes a genuine 10-second quarter-mile car. YPG Motorsport proved this with the world's first sub-10-second W205 C63 — 9.97 seconds at 828 WHP at Beech Bend Raceway Park.The downpipe is the single highest-impact bolt-on modification for the C63 platform. This guide covers everything you need to know: catless versus 200-cell high-flow catted options, real-world power gains at every stage, exhaust sound transformation,...

Complete guide to C63 W205 M177 downpipes — catless vs 200-cell vs 400-cell GESI, real power gains, exhaust sound changes, fitment for all body styles, and installation overview.

The downpipe is the single highest-impact bolt-on modification you can make to the Mercedes-AMG C63 and C63 S. On the W205 M177 4.0-liter twin-turbo V8, the factory catalytic converters sit directly downstream of the turbochargers inside the hot-vee — creating the biggest restriction in the entire exhaust system right where exhaust gas velocity is highest. Replacing them with aftermarket downpipes is how you go from a fast sedan to a sub-10-second quarter-mile car.This is the same platform — and the same downpipes — that set the world record for the first sub-10-second Mercedes-AMG C63 W205 quarter mile: 9.97 seconds at...