Engine Modifications & 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
Advanced Workshop & Tools
Tailored Solutions for Every Vehicle
Trusted Nationwide
Complete Care, All in One Place
Customer Reviews
Posted on Anil SoniTrustindex verifies that the original source of the review is Google. Thank you guys for your professional, dedicated and honest opinion. You made my day by fixing my son's car so he could use it for DoE at very short notice. Max and Kay were brilliant and I would definitely recommend this garage as a organised and trustworthy business. Keep up the good work.Posted on subin pradhanTrustindex verifies that the original source of the review is Google. Took my BMW 440i to install downpipe and mid pipe. Top guys with good service and reasonable price. Will be going back for more work done.Posted on J JareCkiTrustindex verifies that the original source of the review is Google. I just done Stage1 in my audi s3, car drive superb, excelent service, thanks Ben,Sam and Onyx team! Brilliant workPosted on Dan MayTrustindex verifies that the original source of the review is Google. Honest and knowledgable! Rare these days - saves me hundreds by checking my Golf R properly. Will only use these guys from now onPosted on Darren DawesTrustindex verifies that the original source of the review is Google. I took my jaguar xfr to these guys for a re map . Excellent service. They could not have been more helpful. Very knowledgeable they definitely know what they are doing. If your looking for a re map I would highly recommend you speak to them.Posted on HanaTrustindex verifies that the original source of the review is Google. I was recommended Onyx to get my diamond-cut alloys refurbished. I am located an hour away but the recommendation was important so decided to leave my car with these guys. First impressions, the team were very polite, friendly (Essan, Ben and the guys that actually did the refurb in the intense heat) The prices were competitive. And the quality of work was super. There was slight miscommunication post the sale (which happens) but I was pleased they resolved this to my satisfaction. One idea I would suggest is advising the customer 'before' the work starts that the TPF valves may need replacing so we have the option to decide whether to do it whilst the wheels are off anyway rather than post refurb to avoid scratching the newly done alloys. Otherwise happy with my overall experience.Posted on MarkTrustindex verifies that the original source of the review is Google. Amazing servicePosted on pavan khanguraTrustindex verifies that the original source of the review is Google. The best experience ever well organised clean friendly team and the experience was amazing A big up to the whole staff.
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.
Why Choose Onyx Performance for Servicing?
Experts in Performance Cars
Correct Service Schedules
Quality or OEM Parts
Full Vehicle Inspection
Honest Advice, No Surprises
Fast, Trusted & Tracked
Frequently Asked Questions
No – while we specialise in high-performance and luxury vehicles, we also carry out upgrades for vans, SUVs, 4x4s, and everyday cars.
Yes – we can rebuild engines with forged components, uprated bearings, and improved cooling systems for higher power handling.
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.
Yes – our custom ECU mapping ensures your modifications work together perfectly, maximising performance and reliability.
Depending on the upgrade, fuel economy can sometimes improve under light driving, but maximum power settings may use more fuel.
Absolutely – we source high-quality components from trusted brands and can install them to the highest standards.
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