Mercedes GLS 63 AMG RENNtech ECU Upgrade

Part # 54.166.GLS63BT
Price: $3,495.00 Each

RENNtech M157 Biturbo ECU Upgrades are TÜV approved!

Our proprietary ECU upgrade for the Mercedes M157 engine offers huge gains in performance across the entire RPM range without sacrificing around town comfort or daily driver reliability.

Our ECU tune offers the biggest performance gains on the market; increasing performance from 550 HP and 560 lb/ft torque, to an astonishing 625 HP and 668 lb/ft at the crank! 


GLS 63 (X166) Stock Performance:

  • 577 HP @ 5250 RPM; 561 LB-FT @ 1,750-5,250 RPM
  • Note: We have found the new M157 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.


Modified Performance:

  • 669 HP @ 5500 RPM; 738 LB-FT @ 3800 RPM
Images are provided by the manufacturer/supplier and may be a generic photo for representation purposes, and not of the actual product. Pricing also subject to change without notice.

GMP 710 Pressley Road Charlotte, NC 28217 Phone: 888.488.2028 Fax 704.523.4910