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Engine Modifications & Performance Upgrades for All Vehicles

Engine Modifications and Performance Upgrades for All Vehicles

Engine Modifications and Performance Upgrades for All Vehicles

From subtle performance enhancements to full race-spec builds, our workshop in Langley, Slough offers engine modifications and upgrades for all vehicle types – including daily drivers, performance cars, luxury models, and track-prepared machines. We combine precision engineering, premium parts, and expert craftsmanship to deliver power, reliability, and drivability in perfect balance.

Our services cover everything from bolt-on upgrades such as high-flow air intakes, sports exhaust systems, and performance intercoolers, to comprehensive engine builds with forged internals, uprated fuelling systems, and custom ECU calibrations. Each upgrade is tailored to your vehicle’s specific needs and your driving goals, ensuring you get maximum performance without compromising longevity.

Whether you’re seeking sharper throttle response, increased horsepower, improved torque delivery, or track-ready reliability, our technicians use proven performance tuning methods backed by dyno testing and real-world performance data. We work on all major brands – from hot hatches and SUVs to supercars and specialist imports – delivering upgrades that transform your 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.

Book Your Engine Upgrade Consultation in Slough

Unlock your vehicle’s true potential with our expert engine modification and performance upgrade services. Based in Langley, Slough, we deliver custom solutions for all makes and models. Call today to discuss your project with our performance specialists.

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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 only work on performance cars?

No – while we specialise in high-performance and luxury vehicles, we also carry out upgrades for vans, SUVs, 4x4s, and everyday cars.

Can you carry out engine rebuilds as part of an upgrade?

Yes – we can rebuild engines with forged components, uprated bearings, and improved cooling systems for higher power handling.

What’s the difference between Stage 1, 2, and 3 upgrades?

Stage 1 is software-only tuning for stock hardware, Stage 2 includes supporting hardware like exhausts and intercoolers, and Stage 3 involves major engine changes for maximum performance.

Do you offer bespoke tuning for modified engines?

Yes – our custom ECU mapping ensures your modifications work together perfectly, maximising performance and reliability.

Will performance upgrades affect fuel economy?

Depending on the upgrade, fuel economy can sometimes improve under light driving, but maximum power settings may use more fuel.

Can you supply performance parts as well as fit them?

Absolutely – we source high-quality components from trusted brands and can install them to the highest standards.

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