Nforcd B58 550+ pack

Unlock serious performance from your BMW B58

Ready to transform your turbocharged straight six with a proven upgrade bundle that delivers real-world pace and reliability. This B58 power package is built around quality hardware and a bespoke ECU calibration to deliver strong, repeatable gains on 99 RON petrol, with crisp throttle response and factory-like drivability.

Our team has installed and tuned this setup many times and the feedback has been fantastic. Customers love the torque, the top-end power and the OE-plus feel day to day. If you want more punch without compromise, this is the smart way to do it.

What is included

• Professional installation at MJ Modifications in Warwickshire
• Custom Stage 3 ECU calibration tailored to your car
• High-performance Flowmax turbocharger
• Dorch high pressure fuel pump upgrade
• De-cat downpipe (motorsport use only) with fresh gaskets
• Engine oil and filter service at time of install

This is our base setup that typically targets around the 450 hp mark on the right fuel and supporting health. Want even more headroom. Select from the proven add-ons below to push further.

Popular add-ons to go further

• Osprey intake systems V1, V2 or V3
• High-flow panel filter
• Osprey 4.5 inch heat-shield de-cat downpipe
• Osprey 5 inch de-cat downpipe
• Osprey 5 inch Super Sport catalytic converter
• Osprey 4.5 inch Sport catalytic converter
• Additional custom mapping options
• Dyno session to verify power and torque
• Pure 800 turbocharger options including cast variants
• BigBoost turbo upgrade
• Alternative fuel system upgrades from our range

Looking for extreme power. With methanol and full supporting hardware we can take suitable builds into the 600 to 700 hp range. These are fully custom projects and quoted individually.

Fuel and tuning notes

• Developed for 99 RON pump fuel in the UK
• No E30 ethanol blends on this calibration
• Health check recommended before tuning to ensure the best results

Why choose MJ Modifications

• Specialists in BMW B58 performance upgrades and calibration
• In-house experience with this exact hardware combo
• Smooth, reliable mapping that feels OEM plus
• Happy customers and repeat builds across the Midlands and beyond

Fitting and booking

Installation and setup are carried out at our Warwickshire workshop. Want a quote, lead time or advice on the best spec for your goals. Email info@mjmodifications.co.uk and our team will help.

Place your order and we will contact you to arrange a date for fitting and tuning.

De-cat components are intended for off-road or motorsport use only where applicable.

Search-friendly terms

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