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RENNtech ECU+ Upgrade | C218 | CLS63 AMG | 669 HP / 734 LB-FT | M157 | 5.5L V8 BiTurbo | MY2012-13

ECU+ Upgrade | Up to 669HP / 734TQ | Gains: +119HP / +190TQ
SKU: ECU:54.218.CLS63BT
Retail price without tax: $2,980.00

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RENNtech HHT (hand held tuner) allows you the unlimited ability to switch between tuned and stock ECU programming and requires no ECU removal!

Our proprietary tuning module stores both the RENNtech tuned file and your vehicles stock file. The module plugs directly into the OBD2 port and delivers the file you choose directly to the ECU. Programming takes only a few minutes and the vehicle can be reflashed at any time as many times as you wish.

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 with our dyno results increasing performance from 556 HP and 544 lb/ft torque, up to an astonishing 669 HP and 734 lb/ft at the crank! This allows the CLS63 AMG to run the quarter mile on D.O.T. street tires in an impressive 11.3 seconds at 125 mph with 0-60 mph coming in a mere 3.4 seconds.

Equipped with drag radials on the CLS we were able to achieve an even more impressive quarter mile time. The CLS was able to rocket down the drag strip; clocking a quarter mile time of 10.9 seconds @ 129 mph with 0-60 mph coming in 3.2 seconds!



Performance Numbers Overview 


CLS63 AMG (C218 | PFL MY2012-13 | RWD | M157 | 5.5L V8 BiTurbo) Stock Performance (at crank):

  • Rated by Mercedes-Benz:      518 HP @ 5,500rpm; 520 LB-FT @ 2,000-4,500rpm
  • Rated by RENNtech:               550 HP @ 5,500rpm; 544 LB-FT @2,800-3,900rpm
    • Note: Mercedes M157 engine performance when measured, obtains higher power numbers than rated from factory.



CLS63 AMG (C218 | PFL MY2012-13 | RWD | M157 | 5.5L V8 BiTurbo) Modified Performance (at crank):

  • Rated by RENNtech:               669 HP @ 5,500rpm; 734 LB-FT @ 3,700rpm
                                                    575 awhp @ 5,500rpm; 631 awtq @ 3,700rpm
    • Crank Performance Numbers are calculated with a 14% Drivetrain loss on RWD vehicles.



Contact us

7825 SW Ellipse Way, Stuart, FL 34997
(+1) 561 - 845 7888
Mon - Fri 9am - 6pm


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7825 SW Ellipse Way - Stuart, FL 34997
TEL: 561.845.7888 FAX: 561.845.6777 E-MAIL: