Mercedes A35 / CLA35 / GLA35 / GLB35 AMG Remapping and Tuning

Unlock the full potential of your Mercedes A35, CLA35, GLA35, or GLB35 AMG with Onyx Performance, based in Slough, Berkshire, just outside West London. Whether you’re looking for Stage 1 tuning for improved power and efficiency or Stage 2 upgrades for enhanced performance, we offer expert ECU remapping, servicing, and performance modifications tailored specifically for your AMG 35-Series model.

Our Stage 1 and Stage 2 tuning have been extensively developed in-house on our 4WD Dyno, ensuring optimal performance, reliability, and drivability.

Mercedes A35 / CLA35 / GLA35 / GLB35 AMG Stage 1 & Stage 2 – Power Gains

Stage 1 – Power Gains:

Stock Performance: 306HP / 400Nm
Stage 1 Remap: 360HP / 480-490Nm
Hardware Required: None

Our Stage 1 remap is designed for vehicles with stock hardware, delivering instant improvements in power, torque, and throttle response while maintaining factory reliability. The refined ECU calibration enhances turbo efficiency, acceleration, and overall drivability.

Stage 1 tuning provides a noticeable increase in performance while maintaining daily usability and fuel efficiency.

Stage 2 – Power Gains:

Stock Performance: 306HP / 400Nm
Stage 2 Remap: 380HP / 520Nm
Hardware Required:
- Decat Downpipe or High-Flow Sports Catalyst
- Cat-Back Exhaust System (Optional but recommended for improved performance and sound)
- Upgraded Air Filter
- Bigger Intercooler

Stage 2 tuning builds on Stage 1 with essential hardware modifications to improve airflow, cooling, and exhaust efficiency, unlocking even greater power and torque.

Stage 2 is ideal for enthusiasts looking for more aggressive performance while maintaining reliability.

Onyx Performance – Mercedes A35 / CLA35 / GLA35 / GLB35 AMG Remap Service Includes:

✔ Rolling Road (Dyno) Testing for accurate power measurement
✔ Data Logging and Diagnostics to ensure optimal tuning
✔ Before and After Performance Printouts
✔ Engine Smoke Test to check for Boost/Vacuum Leaks
✔ Catalyst Efficiency Fault Code Delete (Optional)
✔ Speed Limiter Removal (Optional)
✔ Overrun Crackles (Optional)
✔ Comprehensive Diagnostic Check

All remaps are developed in-house and tested to provide maximum performance without sacrificing reliability.

Exhaust Upgrades for Mercedes A35 / CLA35 / GLA35 / GLB35 AMG

Upgrading your AMG 35-Series exhaust system enhances performance and sound. We offer:

? Decat Downpipes – Increases power and efficiency by removing exhaust restrictions
? High-Flow Sports Catalysts – Reduces backpressure while maintaining emissions compliance
? Cat-Back Exhaust Systems – Improves exhaust tone and performance
? GPF Delete – Recommended for maximum sound and performance

Pairing an exhaust upgrade with Stage 2 tuning optimises power gains and delivers an exhilarating driving experience.

Servicing and Maintenance for Mercedes A35 / CLA35 / GLA35 / GLB35 AMG

Regular servicing is essential to maintain reliability and peak performance. At Onyx Performance, we offer:

? Routine Servicing: Oil changes, filter replacements, and essential maintenance
? Brake Repairs and Upgrades: OEM replacements and high-performance braking systems
? Suspension Maintenance & Upgrades: Optimising handling and ride comfort
? Diagnostics and Fault Repairs: Advanced system checks to prevent potential issues

With our expertise in Mercedes AMG tuning, we ensure your A35, CLA35, GLA35, or GLB35 runs at its best, mile after mile.

Styling, Performance Upgrades & Vehicle Security

Enhance your Mercedes A35 / CLA35 / GLA35 / GLB35 AMG with custom styling, performance upgrades, and vehicle security solutions:

Styling and Performance Upgrades:

? Aero Kits & Carbon Fibre Components – Enhanced styling and aerodynamics
? Lowering Springs & Coilovers – Improved handling and aggressive stance
? Big Brake Kits – High-performance braking systems for superior stopping power

Vehicle Security Solutions:

Protect your Mercedes AMG 35-Series with advanced 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 enhanced security
? Fleet Trackers – Ideal for monitoring and securing multiple vehicles

All security systems are professionally installed to seamlessly integrate and maximise protection.

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 Mercedes A35 / CLA35 / GLA35 / GLB35 AMG models, ensuring maximum performance, reliability, and efficiency.

Our dedicated team is committed to providing the best tuning solutions in the UK for Mercedes performance vehicles.

Flexible Finance Options

? Spread the cost of your Mercedes AMG 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 Mercedes A35 / CLA35 / GLA35 / GLB35 AMG today with Onyx Performance. Whether you’re looking for Stage 1 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 security options!

Explore all tuning packages in our shop – Klarna, PayPal & Clearpay available at checkout!

Mercedes A35 CLA35 GLA35 GLB35 AMG – Remap/Tuning Packages