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The Mercedes-AMG GT family runs the M178 — the dry-sump variant of AMG's 4.0L twin-turbo V8. Like its wet-sump sibling (the M177), the M178's stock high-pressure fuel pump is the first bottleneck when pushing beyond factory output. This guide covers HPFP upgrade options specifically for the AMG GT, GTS, GTC, GTR, and Black Series. M178 vs M177 — What's Different? The M178 shares the same 4.0L twin-turbo V8 block architecture as the M177 but uses a dry-sump lubrication system instead of wet sump. This allows the engine to sit lower in the chassis for a lower center of gravity —...

The Mercedes-AMG GT is one of the most capable grand tourers ever built — and its M178 4.0-liter twin-turbo V8 is the heart of that capability. Whether you own the GT, GTS, GT R, GT R Pro, or GT C, upgrading the factory downpipes is the single most effective bolt-on modification you can make to unlock serious power from the M178 platform.This guide covers everything you need to know about upgrading the downpipes on your AMG GT: catless versus 200-cell high-flow catted options, real-world power gains at each stage, exhaust sound changes, fitment across every C190/R190 body style, installation considerations,...