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Mercedes-AMG E63 W212, ML63 & G63 W463 Downpipe Guide — Catless, 200-Cell & 400-Cell | M157 5.5T BiTurbo V8 | Power Gains, Sound & Installation
The M157 5.5-liter twin-turbo V8 is one of Mercedes-AMG's most iconic powertrains — a hand-built engine that powered the previous-generation E63, ML63, and G63 from 2012 through 2018. With factory outputs ranging from 550 HP to 585 HP, the M157 was already formidable from the factory. But the factory catalytic converters create a massive restriction downstream of the turbochargers that limits both power delivery and turbo efficiency.This guide covers everything you need to know about upgrading downpipes on your M157-powered Mercedes: catless versus high-flow catted options, real-world power gains, exhaust sound changes, fitment across all M157 models, and why an...