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Mercedes-AMG E63 S W213 Downpipe Guide — Catless vs 200-Cell, M177 Power Gains, Sound & Installation (2026)
The downpipe is the single highest-impact bolt-on modification you can make to the Mercedes-AMG E63 and E63 S. On the M177 4.0-liter twin-turbo V8, the factory catalytic converters sit directly downstream of the turbochargers — creating a massive restriction right where exhaust gas velocity is highest. Replacing them with aftermarket downpipes is how you go from a fast sedan to a 10-second quarter-mile car.This guide covers everything you need to know before buying downpipes for your W213 E63: catless versus 200-cell high-flow cats, real-world power gains, exhaust sound changes, fitment across all body styles, installation, and why a Stage 2...