Transform your Gen 2 B58 powered BMW M240, M340, M440 into a 475whp beast with our simple bolt-on performance package!

Save $298.99 when you purchase this package.

JB4® 475 Wheel Horsepower Gen2 B58 Package

Get up to 475 wheel horsepower while saving time and money with this easy-to-install package. Horsepower gains depend on fuel used.

Vehicle Fitment

• BMW 2 Series
  • 2022+ G42 Gen 2 B58 BMW M240i, M240i xDrive, and M240xi
• BMW 3 Series
  • 2019-2024 G20 G21 Gen 2 B58 BMW M340i, M340i xDrive, and M340xi
• BMW 4 Series
  • 2021-2024 G22 G23 G26 Gen 2 B58 BMW M440i, M440i xDrive, and M440xi including Gran Coupe

Install guides can be downloaded from each product's page.

Package Features & Benefits

• Gain over 475HP with safe, proven JB4 tuning on a locked 🔒 ECU
• Easy plug-and-play installation with no permanent modifications
• JB4 tuner allows wireless on-the-fly power adjustments & data logging
• Upgraded competition intake adds all the air needed for more power
• The BMS oil catch can keeps oil out of your intake system under high boost
  
• New NGK spark plugs and install tools included ( gap to .022")
• Includes the all-new JB4PRO Bluetooth Adapter & Free App 
• Save $298.99 with this package (Financing available)

Kit Includes

• B58 BMW JB4 Performance Tuner
• JB4PRO Bluetooth Adapter & Free JB4PRO App
  
• BMS Turbo Double Baffle Oil Catch Can for G Chassis B58 M240 M340 M440
• 6 NGK 96206 B58 Spark Plugs
• BMS Billet Spark Plug Gapper Tool (12mm)
• BMW / MINI - Magnetic Spark Plug Socket
• Specialty Spark Plug Feeler Gauge
• Official JB4® Logo Car Emblem/Badge
• Official JB4® License Plate Frame
• JB4 Magnetic Air Vent Phone Mount Holder

• Choose one of our B58 intakes
• BMS B58 BMW M240i M340i M440i Competition Cold Air Intake
  
• BMS Silicone Front Mount Cold Air Intake for G Chassis B58 BMW

Recommended Add-ons (Sold Separately)

• BMS Billet Strut Cross Braces for G20 G21 G22 G23 G26 G42 BMW (all engines)
• BMS Billet Oil Filter Cap for B58 BMW Engines
• Fuel-It! Bluetooth FLEX FUEL KIT for the B58 BMW M240i, M340i, & M440
  
• BMS High Output Ignition Coil Kits for BMW, MINI, & Supra

Download the All New JB4PRO Free App

• Download JB4PRO for Android here.
• Download JB4PRO  for iPhone here.

Dyno Results: 2020 BMW M340i