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About Onyx Performance

Welcome to Onyx Performance, your top destination for BMW, Volkswagen, and Audi remapping, and servicing experts. Located in Slough, just west of London, we specialise in advanced ecu remapping services. Our skilled team is dedicated to custom ECU remapping and performance modifications, unlocking the full potential of your vehicle.
Our services include a wide variety from Custom Remapping to Performance Modifications, Dyno Runs, Engine & Gearbox Servicing, Premium Tyre Fitting, Alloy Wheel Refurbishment, Ghost Immobilisers & Fleet Trackers. Using some of the most advanced and sophisticated equipment available, combined with years of experience we are able to tune the vast majority of vehicles on the road today.

£125 Limited Time Offer

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Engine Oil & Filter service including MQB & B58 Engines

Popular in our shop

1500hp Dyno Runs in Berkshire

Featured on Carwow – Check it out! Dyno Runs can be booked online.

5-Star Google Reviews
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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.

Reviews

Onyx Performance – Rolling Road Tuning, Dyno Runs, Car Service Centre & Alloy  Diamond Cut Refurbishment

Posted on Google Google
Anil Soni profile picture
Anil Soni
Google star 1Google star 2Google star 3Google star 4Google star 5Trustindex 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.
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subin pradhan profile picture
subin pradhan
Google star 1Google star 2Google star 3Google star 4Google star 5Trustindex 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.
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J JareCki profile picture
J JareCki
Google star 1Google star 2Google star 3Google star 4Google star 5Trustindex 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 work
Posted on Google Google
Dan May profile picture
Dan May
Google star 1Google star 2Google star 3Google star 4Google star 5Trustindex 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 on
Posted on Google Google
Darren Dawes profile picture
Darren Dawes
Google star 1Google star 2Google star 3Google star 4Google star 5Trustindex 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 Google Google
Hana profile picture
Hana
Google star 1Google star 2Google star 3Google star 4Google star 5Trustindex 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 Google Google
Mark profile picture
Mark
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Amazing service
Posted on Google Google
pavan khangura profile picture
pavan khangura
Google star 1Google star 2Google star 3Google star 4Google star 5Trustindex 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.

Contact Us

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Situated in Slough, Berkshire, we specialise in offering services such as Remapping, Engine Modifications, Engine and Gearbox Servicing, Premium Tyre Replacement, Car Engine Repairs, Alloy Wheel Refurbishment, Diamond Cut Alloy Refurbishment, Suspension Upgrades, Ghost Immobilisers and Trackers, Number Plates, Exhaust Upgrades (including Resonator delete), Mileage Blockers, DPF and Adblue Solutions, Dyno Power Runs, and ECU Remapping.

Onyx Performance – Remapping & Servicing Centre

OUR SERVICES & PRODUCTS ARE DESIGNED FOR OFF-ROAD USE ONLY. ANY PERSON OR COMPANY WHO INTENDS TO USE OUR SERVICES/PRODUCTS FOR ANY OTHER PURPOSE IS ACTING ON THEIR OWN ACCORD.
Hours
Mon – Friday 10am – 6pm
Saturday 10am – 3pm
All bookings are by appointment only.
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