RENNtech Stage II Turbo Upgrade | M256 | 3.0L I6 Turbo EQ Boost | 540HP/515LB-FT | MY2018+Includes Turbo Upgrade, and ECU Upgrade. Gains: Up to +104HP +105LB FT RENNtech Stage II Turbo upgrade for the AMG 53 M256 AMG 3. 0L Inline 6 engine. RENNtech has been at the forefront of ECU tuning for over 30 years. Through our experience, countless hours of in house Research & Development, and extensive testing we ensure that all RENNtech Performance upgrades offer incredible performance gains as well as rock solid reliability. The RENNtech Stage
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