Performance tune for E+F series N55 - 135i M235i M2 335i 435i 535i 640 - RKTunes

Performance tune for E+F series N55 - 135i M235i M2 335i 435i 535i 640i xdrive35i

This is our tried and tested tune for the N55 platform. These tunes were designed on a Dynojet dyno and tested in the real world! 

We personally recommend using MHD for all tuning(requires purchase of MHD adapter and flasher license), but is not required if you are only using our OTS tune. Only required if you are seeking custom tuning/datalogging, you must also purchase the MHD monitor license as well.

 If you do not want to use MHD, a Windows computer is required to utilize the RK-Tunes flash software. The device must have a ethernet port, or you must have a ENET to USB adapter. Check FAQ section for windows device recommendation.

⦁ Increased boost pressure
⦁ Top speed governor removed
⦁ Increased RPM rev limit
⦁ VANOS cam timing adjustment
⦁ Improved throttle response
⦁ Increased valvetronic valve lift
⦁ Ignition timing enhancements
⦁ Air/Fuel Ratio enhancements


  •  Fuel - Selectable fuel octane rating (91, 93) - E85 tuning also available
  • Burble - Emits flame and backfire when lifting off throttle. Only suggested for catless exhaust systems.
  • Rear O2 Sensor Delete - If you are running aftermarket headers please select O2 Sensor delete. We will remove all coding associated with rear O2 sensors 
  • Cold Start Delete - All BMW's have a cold start calibration to heat up the catalytic converters. If you're unhappy with the way your BMW idles/runs while cold, select this option and we will adjust the cold start in your tune. Highly advised if you are running a catless exhaust system.
  • Flex Fuel capabilities - F-SERIES ONLY (REQUIRES MHD & ECA KIT) No longer do you have to calculate how much E85 you have to put in your car, or reflash when changing fuels! Just fill it up and the ECU will auto adjust to run based off of the ethanol content inside your gas tank.

60-100+ WHP


Supported Vehicles:

  • 2011-2013 E9x 335i
  • 2011-2013 E8x 135i
  • 2011-2013 E70 X5 35i
  • F10 535i
  • F0x 640i
  • F15 X5 35i
  • F16 X6 35i
  • F3x 335i/435i
  • F22 M235i 235i
  • 2015-2018 F87 M2