BMW M Performance Engine Upgrades and ECU Tuning

BMW M Performance Engine Upgrades & ECU Tuning

Unlock the full performance capability of your BMW M with our specialist engine tuning, performance upgrades, and custom exhaust solutions – all carried out at our Langley, Slough workshop. Whether it’s an M2, M3, M4, M5, M8, or a classic M model, we deliver precision-engineered enhancements that sharpen throttle response, increase power, and improve driving dynamics while preserving reliability.

Our BMW tuning packages include Stage 1, Stage 2, and Stage 3 ECU remapping for the S55, S58, S63, and B58 performance engines, as well as TCU gearbox software for lightning-fast shifts. Hardware upgrades include high-flow downpipes, hybrid turbos, carbon intakes, uprated intercoolers, and performance cooling systems. For exhausts, we offer valved sports systems, stainless steel or titanium builds, all designed to enhance performance and give your M car a commanding, authentic sound.

Whether you’re looking for fast-road upgrades or a track-ready BMW M build, our team has deep knowledge of the M division’s engineering DNA. BMW enthusiasts across Slough and the wider UK choose us for our proven results, attention to detail, and passion for performance.

Tuning Gain Calculator

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.

Customer Reviews

Book Your BMW M Performance Upgrade in Slough

Experience transformative performance gains with our BMW M tuning packages. From ECU remapping and turbo upgrades to bespoke exhaust systems, we deliver precision enhancements for road and track. Based in Langley, Slough – book your consultation today and unleash the true potential of your M car.

5-Star Google Reviews

0 +

Years of Experience

0 +

Customer Satisfaction

0 %

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 tune all BMW M models?

Yes – we work on every M model, from the M2 and M3 to the M4, M5, M8, and earlier generations like the E46, E92, and F-series.

What power gains can I expect from ECU tuning?

Depending on your model and upgrade stage, you can expect +40 to +200 bhp along with significant torque increases for rapid acceleration.

Can you upgrade the exhaust on my M car?

Absolutely – we fit valved systems, high-flow downpipes, and custom stainless or titanium exhausts for more power and a deeper, sportier sound.

Do you offer turbo and supercharger upgrades?

Yes – we can install hybrid turbos, big-turbo conversions, or supercharger kits for maximum power while keeping drivability in check.

Will tuning affect my BMW’s reliability?

Our tunes are developed to be safe and reliable, with optimised fuelling and boost levels that protect engine and transmission health.

Do you offer supporting upgrades for track use?

Yes – including performance cooling systems, uprated brakes, and suspension packages to handle increased power on track days.

Get a quick quote

Drop us a line! or Message us on WhatsApp

This site is protected by reCAPTCHA and the Google Privacy Policy and Terms of Service apply.