Performance tune for F+G Series B58 - 240i 340i 440i 540i M240 M340 M440 A90 Supra

🚘 Horsepower Gains

B58 Gen 1 Build Breakdown (2016–2018 models)

Stock WHP: 330

440 WHP (+110 WHP over stock)

• MHD Super License (Link to product)
• MHD Wireless Flash Adapter (Link to product)
• NGK 94201 spark plugs (Link to product)
• RK Tunes Front Mount Intake (Link to product)
• RK Tunes High Output Ignition Coil Packs (Link to product)
• RK Tunes Charge Pipe
• RK Tunes Custom tune (Link to product)

455 WHP (+125 WHP over stock)

All above PLUS below:

• Hi-Flow Catted Downpipe
• 93 Octane

510 WHP (+180 WHP over stock)

All above PLUS below:

• E30 Fuel Blend
• MHD Flex-Fuel Kit (Link to product)

650 WHP (+320 WHP over stock)

All above PLUS below:

• RK Tunes Dual Ball Bearing Turbo
• DS2.5 HPFP OR Port Injection with MOTIV Reflex & 750cc+ Injectors (Link to product)
• RK Tunes Low-Pressure Fuel Pump

750 WHP (+420 WHP over stock)

All above PLUS below:

• Stage 1 Transmission / Upgraded Clutch (manual)

850–900 WHP (+520–570 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 (+620–770 WHP over stock)

All above PLUS below:

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

Notes (B58 Gen 1):

• ✅ Spark plugs every 10k miles (NGK 94201).
• ✅ 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 upgraded clutch at higher WHP.
• ✅ Port Injection > DI-only for high WHP builds.
• ✅ 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: .030
  – 551–700 WHP: .025
  – 701–850 WHP: .022
  – 851–1000 WHP: .018
  – 1000+ WHP: .016