Mercedes-AMG GLS 63 (X167) ECU Tune

Custom OEM-ECU calibration for the Mercedes-AMG GLS 63 (X167). Factory output is 603 hp and 627 lb-ft; Stage 1 takes it to 670 hp and 705 lb-ft — a gain of 67 hp and 78 lb-ft — with no hardware changes required. Stage 1 — 670 hp / 705 lb-ft. Stock exhaust, stock intake. Nothing to buy. Stage 2 — 695 hp / 730 lb-ft. With downpipes or a sports exhaust fitted. Mail-in ECU. You remove the ECU using the instructions we email you and ship it to us. We flash it on the bench and send it straight back, normally within 24–48 hours of arrival. The car stays in your garage the whole time.Every file is built and signed off individually against your own datalog, not pulled from a shelf. One free revision for 30 days — change your exhaust or your fuel and we update the calibration at no charge. Emissions equipment is not touched.Figures are estimates at the crank for a healthy car on good fuel. Real-world results vary with vehicle condition, fuel quality, dyno type and ambient conditions.