Mercedes-AMG Engine Performance Upgrades, ECU Remapping & Exhaust Tuning in Langley, Slough

Mercedes-AMG Performance Upgrade

Unlock the true performance potential of your Mercedes-AMG with our expert tuning, engine modifications, and custom exhaust systems – right here in Langley, Slough. Whether you drive an A45, C63, E63, G63, AMG GT, or any other AMG model, we deliver precision-engineered upgrades that enhance acceleration, throttle response, and driving excitement while maintaining long-term reliability.

We offer Stage 1, 2, and 3 ECU tuning for AMG’s M133, M177, M178, and M139 engines, as well as TCU gearbox software to sharpen gear changes. Our performance hardware upgrades include high-flow downpipes, hybrid turbochargers, carbon fibre intakes, and uprated intercoolers – all installed by AMG specialists. For exhausts, we design and fit hand-crafted stainless steel or titanium systems that deliver both increased power and a distinctive AMG soundtrack.

From fast-road tuning packages to fully track-focused AMG builds, we provide bespoke solutions tailored to your driving style. Mercedes-AMG owners across Slough and beyond choose us for our deep platform knowledge, precise craftsmanship, and proven results on both road and circuit.

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Why Choose Onyx Performance?

As Seen on Carwow

We’ve been proudly featured on Carwow – a testament to the quality, professionalism, and performance-focused results that set us apart. Watch our feature here to see us in action.

Expertise You Can Trust

With years of experience and deep technical knowledge, our team understands performance vehicles inside and out – from custom remaps to high-end servicing.

Advanced Workshop & Tools

We operate from a state-of-the-art facility in Slough, equipped with cutting-edge diagnostics, dyno testing, and industry-leading tools for accurate, high-quality work.

Tailored Solutions for Every Vehicle

We don’t believe in one-size-fits-all. Every car gets a bespoke approach, ensuring the best results whether it’s a remap, upgrade, or routine service.

Trusted Nationwide

Performance enthusiasts from across the UK come to Onyx because they know they’ll receive premium-quality workmanship, careful attention to detail, and honest advice.

Complete Care, All in One Place

From tuning and servicing to tyres, trackers, and immobilisers – we offer a full suite of services under one roof, all with a strong focus on safety, reliability, and top-tier customer support.

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Book Your Mercedes-AMG Performance Upgrade in Slough

Transform the way your AMG performs and sounds with custom ECU tuning, turbo upgrades, and bespoke exhaust systems. Based in Langley, Slough, we specialise in precision AMG performance engineering for road and track. Book your upgrade consultation today and feel the difference.

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Why Choose Onyx Performance for Servicing?

Experts in Performance Cars

We know how to properly care for performance, modified, and luxury vehicles. Our team has the skills and experience to handle specialist requirements confidently.

Correct Service Schedules

Every service follows the exact schedule recommended by your vehicle’s manufacturer, helping maintain performance and protect your warranty.

Quality or OEM Parts

We only use high-quality aftermarket or original manufacturer parts, ensuring long-lasting reliability and top-level performance.

Full Vehicle Inspection

Our service goes beyond just changing oil. We inspect all key systems to keep your car safe, smooth, and road-ready.

Honest Advice, No Surprises

With transparent pricing and expert recommendations, you’ll always know what your car needs – no upselling, no hidden fees.

Fast, Trusted & Tracked

We offer quick turnaround, maintain service records, and send reminders – that’s why customers travel to us from across the UK.

Frequently Asked Questions

Do you work on all Mercedes-AMG models?

Yes – from the A45 and CLA45 hot hatches to the C63, E63, GT R, and G63, we have tuning solutions for every AMG.

How much extra power will my AMG gain from tuning?

Depending on the model and upgrade stage, gains range from +50 to over +200 bhp, with significant torque increases for instant acceleration.

Can you upgrade the AMG exhaust system?

Absolutely – we offer valved sports exhausts, high-flow downpipes, and custom stainless or titanium systems for a more aggressive sound and better performance.

Do you provide turbo upgrades for AMG engines?

Yes – we fit OEM+ hybrid turbos or full big-turbo conversions for maximum power while retaining drivability.

Will ECU tuning affect reliability?

Not with our approach – all maps are custom-developed for safe power delivery, keeping engine and transmission health a priority.

Do you offer performance cooling solutions for AMG models?

Yes – including upgraded intercoolers, radiators, and oil cooling systems to maintain peak performance on spirited drives or track days.

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