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The Mercedes-AMG M177 4.0L twin-turbo V8 is one of the most tunable production engines ever built. Once you've pushed past Stage 2 ECU calibration and downpipes — somewhere in the 650–700HP range — the factory turbochargers become the bottleneck. The compressor wheels run out of airflow, exhaust gas temperatures climb, and the power curve flattens. That's where turbo upgrades come in. This guide compares the leading M177 turbo upgrade options available in 2026, covering specifications, power targets, pricing, and what each option is best suited for. We sell turbo upgrades ourselves, so we're transparent about that — but this guide...