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

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

$ 999.99
Select Tune:
Flex Fuel (ReFlex or MHD Can):
Additional Maps (Specify Fuel Blend/Goals In Text Box Above):
⚡ Instructions sent immediately after purchase
🔧 Custom tune delivered within 2 business days

This is our custom tune for N55-powered vehicles!

Tuning timeframe :

Unlimited Remote Tune Revisions via email (6-Month Access) or One-Time Live Remote 
Tuning Session. For more information, CLICK HERE

ALL TUNING IS DONE VIA MHD ONLY. Features such as burble and antilag (if applicable) will be adjustable via MHD with our tune!  For more info on MHD, CLICK HERE

Direct Injection VS DI + Port Injection Comparison. For more information CLICK HERE

Estimated power gains below are based on previous tuned cars. Similar builds can net similar gains (May vary, depending on conditions, etc.)

Stock WHP: 310

360 WHP (+50 WHP over stock)

400 WHP (+90 WHP over stock)

All above PLUS below:

  • Hi-Flow Catted Downpipe

510 WHP (+200 WHP over stock)

All above PLUS below:

  • E30 Fuel Blend
  • MHD Flex-Fuel Kit (Link to product)
  • Upgraded HPFP (TU/DS2.5)

600 WHP (+290 WHP over stock)

All above PLUS below:

  • RK Tunes Dual Ball Bearing Turbo
  • Port Injection with 750cc+ Injectors
  • MOTIV Reflex (Link to product)
  • RK Tunes Low-Pressure Fuel Pump

750 WHP (+440 WHP over stock)

All above PLUS below:

  • Full-Frame Turbo (6266+)
  • RK Tunes Crank Hub
  • Stage 1 Transmission / Upgraded Clutch (manual)

850–900 WHP (+540–590 WHP over stock)

All above PLUS below:

  • Full-Frame Turbo (6466)
  • Charge Air Cooler / Upgraded Intake Manifold
  • Stage 2 or Better Transmission

950–1100+ WHP (+640–790 WHP over stock)

All above PLUS below:

  • Full-Frame Turbo (68–70mm+)
  • Fully Built Engine
  • Full Low-Pressure Fuel Pump System (2+)

General Information:

  •  Spark plugs every 10k miles (NGK 97506)
  •  Ignition coils every 50K miles
  •  New factory direct injectors suggested every 70K miles
  •  Hi-Flow Catted Downpipes recommended
  •  Charge pipes get brittle and break randomly
  •  Manual cars require an upgraded clutch as WHP increases
  •  Port Injection > DI-only for high WHP
  •  RK-Tunes parts recommended but not mandatory.
  •  We NEVER tune with methanol injection
  •  See Direct Injection vs Direct Injection + Port Injection breakdown for all cars
  •  Spark Plug Gaps:
    - ≤550 WHP: .025
    - 551–700 WHP: .022
    - 701–850 WHP: .020
    - 851–1000 WHP: .018
    - 1000+ WHP: .016

Still have questions? Check our Tuning Tech Talk and Build Suggestions, which can be found at the top of the page.

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

Vehicle not listed? Email us!
Performance tune for E+F series N55 - 135i M235i M2 335i 435i 535i 640i xdrive35i
Performance tune for E+F series N55 - 135i M235i M2 335i 435i 535i 640i xdrive35i Sale price$ 999.99
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