Audi RS Engine Modifications, Performance Tuning & Exhaust Upgrades in Langley, Slough

Audi RS Performance Upgrade Modifications

Unlock the full potential of your Audi RS with our expert engine modifications, ECU tuning, and exhaust upgrades at our Langley, Slough performance workshop. Whether you own an RS3, RS4, RS5, RS6, RS7 or TT RS, we deliver precision-engineered upgrades that enhance power, responsiveness, and driving excitement – without compromising reliability.

We specialise in stage 1, 2, and 3 performance tuning, custom ECU and TCU remapping for DAZA, CEPA, and 4.0 TFSI engines, and hardware upgrades such as uprated turbochargers, high-flow downpipes, performance intercoolers, and induction systems. Our custom stainless steel and titanium exhaust fabrication delivers both performance gains and the perfect sound profile for your RS.

Audi RS drivers across Slough and beyond choose us for our deep platform-specific knowledge and commitment to precision. From fast road setups to track-prepared RS builds, every upgrade is tailored to your driving goals and backed by professional installation.

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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 Audi RS Performance Upgrade in Slough

Experience unmatched power, sharper throttle response, and a more aggressive exhaust note with our Audi RS tuning, turbo upgrades, and bespoke exhaust systems. Based in Langley, Slough, our RS specialists deliver results you can feel from the driver’s seat. Schedule your performance consultation today.

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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 Audi RS models?

Yes – from the legendary B7 RS4 to the latest C8 RS6 and RS7, as well as RS3, RS5, and TT RS models.

What performance gains can I expect from ECU tuning?

Depending on the engine and stage, gains can range from +60 to +200 bhp, with significantly improved torque and throttle response.

Do you offer turbo upgrades?

Yes – we supply and fit OEM+ hybrid turbos and full big-turbo conversions for maximum performance potential.

Can you install a custom exhaust system?

Absolutely – we create hand-built stainless steel or titanium exhausts with tailored sound profiles, from refined sport tones to aggressive track setups.

Is tuning safe for my RS engine?

Yes – we develop all maps with safety margins for both engine and transmission, ensuring performance without sacrificing reliability.

Do you offer performance cooling solutions?

Yes – we install uprated intercoolers, radiators, and oil coolers to keep your RS running at peak performance on road or track.

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