BMW M140i

The BMW M140i is arguably the ultimate “sleeper hatch”. Fitted with the renowned B58 3.0L inline-six turbocharged engine, it offers explosive performance straight from the factory—and even more with a few well-chosen upgrades.

In this guide, we walk through tuning your BMW M140i from Stage 1 to Stage 3, explaining what each stage includes, what gains to expect, and how to do it properly using trusted components—many of which are available at Nevlock.

Why Tune the BMW M140i?

• B58 Engine Platform – Shared DNA with the Supra A90, incredibly strong internals
  
• RWD Hot Hatch Format – Unique in its class
  
• Big Power Potential – Up to 500+bhp with bolt-ons and tuning
  
• Understated Looks – Perfect for those who like performance without shouting

Now you’re looking at supporting mods to handle higher boost and improve airflow.

Required Upgrades:

• Downpipe (Sports Cat or Decat)
  
• High-Flow Intake
  
• Optional: Chargepipes, Turbo Inlet, Inlet Elbow
  

Expected Gains:

• ~440–470bhp / 500–530 lb-ft (torque-limited by gearbox)
  

What Improves:

• Midrange torque and throttle response
  
• Turbo efficiency and spool
  
• Heat management during pulls and track sessions
  

Cost Estimate: £1,200–£1,800

Nevlock Stocks:

• B58-specific gaskets
  
• Intake kits
  
• Turbo hardware and install components
  

Tip: Pair with xHP gearbox flash for faster, stronger shifts.