E63 S RSS

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...

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...