m178 RSS

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 —...

AMG M156 vs M177 vs M178 engine comparison — specs, build costs, and 1,500HP potential. Complete 2026 guide to choosing the right AMG V8 platform for your build.

A blow-off valve (BOV) is one of the most straightforward upgrades available for any turbocharged Mercedes-AMG. When you lift off the throttle under boost, the compressed air in the intake piping has nowhere to go — it slams back into the compressor wheel, creating compressor surge. The factory bypass valve recirculates this air back into the intake tract to manage surge, but on tuned or turbo-upgraded cars running higher boost pressures, the factory valve can struggle to vent quickly enough. An upgraded blow-off valve opens faster, vents more volume, and provides a clean release under higher boost levels — protecting...

The Mercedes-AMG GT lineup (GT, GT S, GT C, GT R) is one of the most sonically impressive platforms AMG has ever produced. The M178 4.0-litre twin-turbo V8’s hot-inside-V turbocharger layout and flat-plane-inspired firing order give it a distinctive character that sets it apart from the M177-powered sedans and SUVs. But the factory exhaust system — while tuned for a refined balance of performance and daily comfort — leaves significant gains on the table in both sound quality and outright power. This guide covers the full exhaust upgrade path for AMG GT M178 models, from downpipes to valved exhaust systems,...

Mercedes-AMG M178 turbo upgrade guide for AMG GT, GTS, GTC, and GTR. Stage 3 and Stage 4 turbo options, power targets from 700 to 1,000+ WHP, supporting mods, and costs from YPG Motorsport.