RENNtech has been at the forefront of ECU tuning since electronic engine management started to show up in vehicles during the mid 1980's! Our experience, countless hours of in house research, development and exhaustive testing ensure that our proprietary ECU upgrade offers incredible performance gains and rock solid daily driver reliability.

RENNtech tuning software for Mercedes offers significant gains in horsepower and torque across the vehicles entire power band. By modifying ignition timing and throttle mapping, optimizing air/ fuel ratios, increasing the engines rev limiter and modifying boost mapping for turbo charged vehicles, RENNtech performance software unleashes your Mercedes true potential.

• Note: We have found the new M279 engine stock performance numbers vary from the baseline figures claimed by Mercedes Benz. We typically see slightly higher baseline numbers than claimed by the factory.

SL 65 (R231) Stock Performance:

• 621 HP @ 4800 RPM; 738 LB-FT @ 2300-3000 RPM

Modified Performance:

• 735 HP @ 5200 RPM; 836 LB-FT @ 3500 RPM

Gains:

• +114 HP & +100 TQ