BMW B58 Performance Tuning & Remapping – M140i, M240i, 340i, 440i, 540i
Unlock the Full Potential of Your BMW B58 Engine with Onyx Performance
If you own a BMW M140i, M240i, 340i, 440i, or 540i with the B58 3.0L turbocharged straight-six engine, you already know it’s one of the most powerful and tunable engines BMW has ever produced. At Onyx Performance, we specialise in BMW B58 tuning, offering Stage 1 and Stage 2 remaps, hardware upgrades, servicing, and immobiliser installations to enhance power, reliability, and security.
Our bespoke ECU and gearbox remaps have been developed on our in-house 4WD Dyno, ensuring precise power delivery, sharper throttle response, and improved turbo efficiency. Whether you want better drivability or track-ready performance, we have the perfect tuning package for your BMW.
BMW B58 Stage 1 & Stage 2 Tuning – Power Gains
Stage 1 Remap – For Stock Hardware
✔ Stock Power: 340HP / 500Nm (varies by model)
✔ Stage 1 Remap: 420HP / 600Nm
✔ Hardware Required: None
Our Stage 1 ECU software optimises the factory tuning to deliver significant power and torque gains, improving throttle response and turbo efficiency. Combined with Onyx Performance Stage 1 Gearbox Software, you’ll experience sharper shifts and enhanced drivability.
Stage 2 Remap – For Performance Hardware Upgrades
✔ Stock Power: 340HP / 500Nm
✔ Stage 2 Remap: 460HP / 680Nm
✔ Hardware Required:
- Decat Downpipe or High-Flow Sports Catalyst
- Upgraded Air Intake System
- Larger Intercooler
- Onyx Performance Stage 2 Gearbox Software (Highly Recommended for Automatic Models)
- Spark Plug and Ignition Coil Upgrade (Essential for reliability under increased boost pressure)
Stage 2 tuning enhances turbo efficiency and airflow, ensuring a more responsive power band and improved cooling capacity.
For owners looking for even more power, we offer Stage 3 hybrid turbo packages, high-pressure fuel pumps, and supporting modifications – contact us to discuss custom builds!
BMW B58 Servicing & Maintenance – Keep Your Engine in Peak Condition
Maintaining your BMW B58 engine is crucial to ensuring long-term reliability and peak performance. At Onyx Performance, we offer comprehensive servicing solutions, from routine oil changes to advanced diagnostics and performance maintenance.
? Routine Servicing: Engine oil and filter changes using high-performance lubricants
? Brake Servicing & Upgrades: OEM replacements and high-performance brake kits
? Suspension & Handling Checks: Ensuring optimal ride quality and control
? Diagnostics & Health Checks: Identifying potential issues before they escalate
? Turbo & Cooling System Inspections: Ensuring optimal airflow and cooling efficiency
We also update your BMW’s digital service history, ensuring your vehicle retains full service records.
Vehicle Security – Immobilisers & Trackers for BMW B58 Models
With modern keyless theft on the rise, protecting your BMW M140i, M240i, 340i, 440i, or 540i is more important than ever. At Onyx Performance, we offer professional security installations, including:
? Autowatch Ghost Immobilisers – Prevents key cloning and unauthorised starts
? MetaTrak GPS Trackers – Live tracking with app-based control
? Scorpion Track Systems – Motion alerts and driver recognition technology
? Fleet Trackers – Perfect for managing multiple high-value vehicles
Our security solutions are professionally installed for seamless integration, giving you peace of mind and ultimate theft protection.
Exhaust Upgrades for BMW B58 – Enhanced Sound & Performance
Enhance the sound and power of your B58-powered BMW with our high-performance exhaust solutions:
? Decat Downpipes – Improves turbo efficiency and exhaust flow for maximum power
? High-Flow Sports Catalysts – Reduces backpressure while remaining emissions-compliant
? Cat-Back Exhaust Systems – Enhances exhaust tone and performance
? Resonator Deletes – Adds a more aggressive, sportier exhaust note
Pairing Stage 2 tuning with an exhaust upgrade allows for maximum power gains and an exhilarating exhaust note.
Why Choose Onyx Performance for BMW B58 Tuning?
✔ BMW Tuning Specialists – Years of experience tuning B58-powered BMWs
✔ Dyno-Proven Results – All software is tested in-house for accuracy and reliability
✔ Safe & Reliable Tuning – Our remaps maintain engine and gearbox longevity
✔ Comprehensive Performance Solutions – From ECU tuning to full custom builds
✔ Flexible Finance Options – Spread the cost of your tuning and upgrades
Book Your BMW B58 Remap or Servicing Today!
? Onyx Performance – Slough, Berkshire – The UK’s BMW tuning specialists. Whether you’re looking for Stage 1 or Stage 2 tuning, exhaust upgrades, servicing, or vehicle security, we have the expertise to transform your BMW’s performance.
? Contact us today to book your remap or servicing appointment!
? Unleash the full potential of your BMW B58 with Onyx Performance! ?