©2016 by Big Duck Club. - All Rights Reserved 

We provide a plug-and-play, tuned, ready to go MS43 engine controller to suit your specific needs. Please choose from the options avaialble when ordering, and contact us for any special requests.


NOTE: We do not recommend raising the rev limit above 6500 on vehicles without an oil pump solution.


This ECU is also unlocked/tuned so you can :

  • Install headers and remove the secondary air pump without tripping a check engine light
  • Make the throttle more responsive
  • Flash the ecu with adjustments without needing checksum calculations (We recomend gallet 1260 for flashing the 64kb file)
  • Delete the often faulty EWS system. The complicated and expensive system is a headache! Car still acts normal, keys still work as they alsoways do
  • Swap a M54 engine easily into any vehicle
  • Tune everything from check engine lights blocking to full turbo builds
  • We provide full tech support if needed


Compatible Vehicles: 

  • All E46 Xi models, regardless of year
  • E46: 325 and 330 vehicles built before mid-2003. If your MAF sensor has 3 wires, you are ms43 
  • All E39 525 and 530 models
  • All 2003-2006 X3 E83 models
  • All 1999-2006 X5 E53 models with a 3 Liter engine


MS43 ECU: N/A Performance Tune

Engine Size
Header/SAP CEL Delete
Rev Limit
Electronic Speed Limiter Delete Select
Throttle Response Enhancement