RennTech Performance ECU Upgrade For Mercedes-Benz C209 CLK 63 AMG

VENDOR: RennTech

SKU: 54.209.CLK63

All orders will include an AutoTalent window decal


RennTech HHT (hand held tuner) allows you the unlimited ability to switch between tuned and stock ECU programming and requires no ECU removal. RennTech 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 has been at the forefront of ECU tuning since electronic engine management started to show up in vehicles during the mid 1980s. RennTech 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 vehicle's entire power band. By modifying ignition timing and throttle mapping, optimizing air-to-fuel ratios, increasing the engine's rev limiter and modifying boost mapping for turbo-charged vehicles, RennTech performance software unleashes the true potential of your Mercedes.


  • Gains:+25 HP and +42 LB-FT
  • Long-lasting and driver reliability
  • Significant gains in horsepower
  • Increases the performance
  • Significant gains torque 
  • Increasing the engine's rev limiter
  • Incredible performance gains

Stock Performance:

  • 478 HP @ 6800 RPM; 465 LB-FT @ 5000 RPM

Modified Performance:

  • 517 HP @ 6800 RPM; 485 LB-FT @ 5200 RPM

Vehicle Fitment:    

  • 2004 Mercedes-Benz C209 CLK 63 AMG
  • 2005 Mercedes-Benz C209 CLK 63 AMG
  • 2006 Mercedes-Benz C209 CLK 63 AMG
  • 2007 Mercedes-Benz C209 CLK 63 AMG
  • 2008 Mercedes-Benz C209 CLK 63 AMG
  • 2009 Mercedes-Benz C209 CLK 63 AMG
  • 2010 Mercedes-Benz C209 CLK 63 AMG


                            Images are for representation purpose only and may differ depending on application.