E63 AMG ECU tunes for the M177 4.0T V8 (W213) and M157 5.5T V8 (W212) — Stage 1 through Stage 3+ calibrations. The W213 E63 S picks up 80–120 WHP on a stock turbo Stage 1 remap; the W212 M157 responds strongly to revised boost and fuel maps with 100+ WHP gains at Stage 2. Remote OBD flash and mail-in bench tuning both available.

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