About Us

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Onyx Performance is an advanced tuning company based in Slough, West of London offering custom ECU tuning and Performance Modifications.

Unleashing the true potential of a vehicle, depending on customer requirements this could be simply to extract as much performance as possible or to generate the most amount of fuel efficiency. 

4WD 1500hp Rolling Road 

We have a state of the art 1500hp 4WD dyno with full engine analysis capabilities to ensure our developments are providing you with the best power gains on the market whilst maintaining optimum reliability for your engine via our live ECU Remapping service.

Would you like to find out what your car is pushing? Good, we also offer power runs on our dyno.

Vehicle Modifications

 We offer performance modifications including Performance Exhaust systems, Turbo upgrades, Intercooler upgrades, Induction kits, Uprated Clutch kits, Performance Brake kits, Suspension, Bushes, HID Light kits and the list goes on, being innovators of performance tuning we work with the top aftermarket part suppliers.  

Servicing and Specialist Services

Onyx Performance is not just a performance house but we also offer Engine and Gearbox Servicing, Engine Carbon Cleaning, Boost Leak Smoke Test, Mileage Blockers, Window Tinting & Chameleon Windscreen Tinting.

 We will update the Digital Service History for most brands within the VAG group. 

DPF & Adblue Solution

We have a vast amount of experience with the often miss understood emission systems on modern diesel vehicles and can offer a wide range of services depending on the customers’ requirements. We offer a professional cost effective solution to fix any DPF or Adblue issues.

Check out our online shop for tuning packages and much more.

Onyx Performance - 4WD Dyno Runs near me - Engine Carbon Clean - Engine Servicing - Performance Exhaust Systems

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Head on over to our services page / drop down list to see a full list of the services we offer.