In pursuit of a gain in power output from this M3s already very capable engine, we equipped it with an ESS Tuning E-Tronic Tuner. The E-Tronic Tuner instantly adds 50-60 wheel horsepower and wheel torque. Unlike other products on the market, the E-Tronic is a sophisticated multi-channel controller that has RPM and MAF integration. This allows for full control of boost at all RPM ranges and proper AFR calibrations. All of this without having to splice a single wire. Calibrations are pre-set so once the E-Tronic is installed; the car is ready to go.

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