Mercedes-AMG Performance Exhaust Systems and Downpipe Upgrades

Mercedes-AMG Performance Exhaust Systems & Downpipe Upgrades

Mercedes-AMG Performance Exhaust Systems

Unleash the full power and sound of your Mercedes-AMG with our performance exhaust system and downpipe upgrade service in Slough. Designed for models such as the C63, E63, A45, G63, and GT AMG, our upgrades deliver more horsepower, improved throttle response, and an aggressive exhaust note that matches the AMG’s racing pedigree.

We supply and fit premium exhaust systems from Milltek, Capristo, Quicksilver, and Scorpion, as well as custom-built exhausts tailored to your AMG. From valve-controlled systems for switchable sound, to high-flow downpipes and decat options, every upgrade is engineered for performance, precision, and reliability.

Based in Slough, we are trusted by AMG owners across Berkshire, London, and the UK who want specialist fitting, premium materials, and performance exhaust modifications that transform the driving experience.

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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Upgrade Your Mercedes-AMG Exhaust in Slough

Transform your AMG with a performance exhaust system or downpipe upgrade, fitted by experienced specialists. Whether you want a deeper road presence, a switchable valvetronic system, or a track-focused downpipe for maximum power, we provide tailored solutions and precision fitting. Contact us today for your Mercedes-AMG exhaust upgrade in Slough or nationwide.

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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 provide exhaust upgrades for all AMG models?

Yes — we work on the full AMG line-up, including the C63, E63, A45, CLA45, G63, GT AMG, and more.

What are the benefits of upgrading my AMG exhaust system?

You’ll enjoy increased power, improved airflow, reduced weight, sharper throttle response, and a more aggressive exhaust tone.

Do you fit downpipes and decat systems for AMG models?

Yes — we install high-flow sports cats, decat downpipes, and GPF/OPF deletes for AMGs, designed to maximise sound and performance (track use only).

Can you fit valvetronic/switchable exhaust systems?

Absolutely — we install valve-controlled systems that allow you to switch between refined daily driving tones and track-inspired aggression at the push of a button.

Are AMG exhaust upgrades road legal in the UK?

Many performance exhaust systems are road legal and MOT-compliant, while decat downpipes and GPF deletes are for off-road/track use only. We’ll guide you on the best setup for your needs.

Do you offer custom exhaust fabrication for AMGs?

Yes — our bespoke fabrication service allows us to build a one-of-a-kind exhaust system tailored to your AMG’s performance goals and desired sound profile.

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