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Mercedes-AMG C63 W205 Downpipe Guide — Catless vs 200-Cell vs 400-Cell GESI, Power Gains, Sound & Installation (2026)
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...