We are an ECU Remapping Specialist and Tuning house based in Berkshire offering a National 4WD Dyno Tuning Service at our workshop. All our software is developed on our state of the art 4WD Dyno handling vehicles with over 1500hp Our services include a wide variety from Performance tuning to engine and gearbox servicing, dyno runs, window tinting and engine carbon cleaning. We offer performance modifications including Turbo upgrades, Supercharger kits, Intercooler upgrades, Exhausts, 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. We have tuned and remapped Ferrari's, Lamborghini's, Mercedes AMG, Maserati's, Porsche's, Audi's, BMW's. Would you like to find out what your car is pushing? Good, we also offer power runs on our Dyno. Rolling Road dyno runs in West London and Berkshire including Slough, Stokes Poges, Farnham Royal, Denham, Maidenhead, Windsor, Ascot, London, Marlow, Bracknell, Staines, Reading, Heathrow, Hayes, Southall, Feltham, Hounslow, High Wycombe and Uxbridge. Onyx Performance is not just a performance house but we also offer Engine and Gearbox Servicing, Engine Carbon Cleaning, Boost Leak Smoke Test, DPF Cleaning, Window Tinting, Stereo Installations and Speaker Upgrades. Our smoke test service can diagnose a leak in the boost pipes or intake system. Every engine service and remap carried out by us comes with a free smoke leak test. Engine Remapping, Chip Tuning, ECU Remap, dyno run, Stage 1 & Economy Remap.