BMW 135i Kits:

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Stage 1 for the BMW 135i twin turbo includes in the installation and tuning of the factory ECU. This system allows Autotech to custom tune your vehicle, adjusting the engine timing, fuel and boost levels to delivery a far superior driving experience. Once custom tuned, expect your BMW to have more torque across the entire rev range as well as improved throttle response, drivability and fuel economy.