475 Wheel Horsepower Package for Gen2 B58 BMW

  • $1,129.00
  • Save $278.99
Shipping calculated at checkout.


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.

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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

Recommended Add-ons (Sold Separately)

Download the All New JB4PRO Free App


Dyno Results: 2020 BMW M340i

BMW M340i dyno horsepower JB4 tuned