BMW M140i / M240i / 340i / 540i (B58) Remapping and Tuning
Unlock the full potential of your BMW M140i, M240i, 340i, or 540i (B58 Engine) with Onyx Performance, based in Slough, Berkshire, just outside West London. Whether you’re new to tuning or looking to take your B58-powered BMW to the next level, we offer expert remapping, servicing, upgrades, and vehicle security solutions tailored specifically for your BMW.
Our bespoke tuning packages are designed to increase power, enhance throttle response, and improve overall drivability, while maintaining reliability, making your B58-powered BMW even more exhilarating to drive.
BMW M140i / M240i / 340i / 540i Stage 1 & Stage 2 – Power Gains
Stage 1 – Power Gains:
- Stock Power: 340HP / 500Nm (varies slightly by model)
- Stage 1 Remap: 420HP / 600Nm
- Hardware Required: None
Our Stage 1 remap delivers instant power and torque gains without requiring any hardware modifications. The optimised ECU calibration enhances throttle response, gear shifts, and turbo efficiency, while maintaining the reliability of the B58 engine.
Stage 2 – Power Gains:
- Stock Power: 340HP / 500Nm
- Stage 2 Remap: Up to 460HP / 680Nm
- Hardware Required:
- Decat Downpipe or High-Flow Sports Catalyst – GPF Delete
- Upgraded Air Intake System
- Larger Intercooler
- Onyx Stage 2 Gearbox Software (Highly Recommended for Automatic Models)
- Spark Plug and Ignition Coil Upgrade (Recommended for Stage 2 tuning to ensure optimal ignition and reliability under increased boost pressure)
Stage 2 builds on Stage 1 with essential hardware upgrades to improve airflow, cooling, and turbo efficiency, unlocking even more power and sharper throttle response.
Looking for More Power?
For enthusiasts seeking maximum performance, we offer Stage 3 tuning packages featuring hybrid turbo upgrades, high-pressure fuel pumps, and supporting modifications for even greater power and torque.
📞 Call us on 01753 439321 to discuss Stage 3 options!
Why Choose Onyx Performance?
At Onyx Performance, we specialise in BMW B58 tuning and provide a range of services to ensure your BMW operates at peak performance while maintaining reliability and drivability:
✔ Rolling Road (Dyno) Testing for precise power measurement
✔ Data Logging and Diagnostics to ensure optimal engine performance
✔ Before and After Performance Printouts
✔ Engine Smoke Tests to check for Boost/Vacuum Leaks
✔ Optional Features: Overrun Crackles, Speed Limiter Removal, and Catalyst Fault Code Deletes
Our expert team ensures your BMW M140i, M240i, 340i, or 540i delivers improved power, torque, and response, while keeping engine safety a priority.
Exhaust Upgrades for BMW B58
Enhance the sound and performance of your BMW with a high-performance exhaust system:
- 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 sound quality
- Resonator Deletes – Adds a sportier, aggressive exhaust note
Pairing Stage 2 tuning with a decat downpipe or high-flow sports catalyst allows for maximum power gains and an enhanced exhaust note.
Servicing and Maintenance for BMW B58 Models
Keeping your BMW B58 engine in peak condition is essential for long-term reliability. At Onyx Performance, we offer:
- Routine Servicing: Oil changes, filter replacements, and essential inspections
- Brake Repairs and Upgrades: OEM replacements and performance brake kits
- Suspension Maintenance: Checks and optimisations for handling and ride comfort
- Diagnostics and Fault Repairs: Advanced system scans to prevent potential issues
With our expertise in BMW B58-powered models, you can trust Onyx Performance to maintain and enhance your vehicle with precision and care.
Styling, Performance Upgrades & Vehicle Security
Elevate your BMW B58-powered M140i, M240i, 340i, or 540i with custom styling, performance upgrades, and vehicle security solutions tailored to your needs:
Styling and Performance Upgrades:
- Aero Kits & Carbon Fibre Components – Aggressive styling and improved aerodynamics
- Lowering Springs & Coilovers – Enhanced handling and stance
- Big Brake Kits – Superior stopping power for track and road use
Vehicle Security Solutions:
Protect your BMW B58 with state-of-the-art security solutions, ensuring peace of mind:
- Autowatch Ghost Immobilisers – Prevents key cloning and unauthorised starts
- MetaTrak Trackers – Live GPS tracking with mobile app integration
- Scorpion Track Systems – Motion alerts and driver recognition for ultimate protection
- Fleet Trackers – Ideal for multiple high-value vehicles with monitoring features
Our security systems are professionally installed to provide seamless integration and maximum protection.
What Our Customers Say
⭐ “Stage 1 completely transformed my M140i! It’s quicker, smoother, and more responsive. Fantastic service from Onyx Performance!”
– Nathan B., London
⭐ “Stage 2 tuning with the decat downpipe and gearbox software took my 340i to a whole new level. The power delivery and exhaust sound are incredible!”
– Arjun K., Birmingham
Opening Hours and Contact Information
📍 Visit Us:
- Location: Slough, Berkshire
- Opening Hours:
- Monday–Friday: 10 AM–6 PM
- Saturday: 10 AM–3 PM
- Closed Sundays
📞 Phone: 01753 439321
📧 Email: info@onyxperformance.co.uk
About Onyx Performance
At Onyx Performance, we specialise in high-quality tuning, remapping, servicing, upgrades, and security solutions for BMW B58-powered models, ensuring maximum performance, reliability, and safety.
Our experienced team is committed to providing the best tuning solutions in the UK for high-performance BMWs.
Flexible Finance Options
💳 Spread the cost of your BMW B58 tuning, performance upgrades, and security solutions with our flexible finance plans, available over 4 monthly payments.
✅ All prices include VAT
✅ No hidden fees
✅ Simple application process
Contact Onyx Performance
Transform your BMW M140i, M240i, 340i, or 540i (B58) today with Onyx Performance. Whether you’re looking for Stage 1 or Stage 2 remapping, performance exhaust systems, styling enhancements, or vehicle security solutions, our expert team is here to help.
📞 Call us now on 01753 439321 to book your tuning service or discuss Stage 2 and security options!
Tags:
BMW M140i, M240i, 340i, and 540i tuning in Slough
BMW B58 Stage 1 remap
BMW B58 Stage 2 tuning with performance exhaust
Downpipe upgrades for BMW B58 models
Spark plug and ignition coil upgrades for BMW B58
Servicing and maintenance for BMW M140i, M240i, 340i, and 540i
Vehicle security for BMW with trackers and immobilisers
Big brake kits for BMW B58
Unlock the true potential of your BMW today!
