Mercedes CLS63 AMG Biturbo 4-Matic (2011-2014) – RENNtech ECU upgrade





RENNtech has been at the forefront of ECU tuning since electronic engine management started to show up in vehicles during the mid 1980’s! Their experience, countless hours of in house research, development and exhaustive testing ensure that their 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.


CLS 63 AMG (W218 – M157 Biturbo 4-MATIC Engine) Stock Performance:

  • CLS 63 AMG:
  • 550 HP @ 5,250-5,750 RPM; 531 LB-FT @ 1,750-5,000 RPM
  • CLS 63 AMG S:
  • 577 HP @ 5,500 RPM; 590 LB-FT @ 2,000-4,500 RPM
  • Note: Mercedes M157 engine performance when measured obtains higher numbers that rated from factory.


Modified Performance:

  • CLS 63 AMG:
  • 701 HP @ 5,550 RPM; 839 LB-FT @ 2,750-4,000 RPM
  • CLS 63 AMG S:
  • 701 HP @ 5,550 RPM; 839 LB-FT @ 2,750-4,000 RPM
*NOTE – We would need either the ECU or the vehicle bringing to our premises in Cheshire

Due to some of the products coming direct from RENNtech USA please allow 7-10 days for delivery

Prices may vary in accordance to the current exchange rate, please contact us for the current confirmed price

Our refunds policy can be found here