Introduction
The BMW B58 engine (found in M140i, M240i, 340i, 440i, Z4, and many newer models) is one of BMW’s strongest and most tunable engines. It offers excellent reliability and huge power gains even with basic bolt-on upgrades. At RDM Performance, we supply proven hardware for both B58 and B58TU engines.
Stage 1 Upgrades (360–400+ bhp)
Stage 1 improves airflow and cooling on a completely stock turbo setup.
Typical Stage 1 mods:
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High-flow air intake
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Charge pipe upgrade
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High-flow panel filter
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Catback exhaust (optional)
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Spark plugs (colder grade recommended)
Benefits:
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Better throttle response
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Improved turbo spool
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More consistent performance
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Safe and reliable for daily road use
Not sure which parts you need?
Message us with your registration number, power goal and budget and we’ll spec the right setup for you.
Stage 2 Upgrades (420–480+ bhp)
Stage 2 unlocks the maximum potential of the stock turbo.
Typical Stage 2 mods:
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Sports cat or decat downpipe
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Larger front-mount intercooler
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Upgraded boost pipe
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Performance intake
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ECU tune (MHD / Bootmod3 / Femto unlock on newer models)
Benefits:
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Big increases in torque
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Faster turbo spool
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Better top-end power
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Ideal fast-road setup
Not sure if Stage 2 is right for your setup?
Message us with your registration number, current mods and power goal and we’ll advise the best next step.
Stage 2+ / Hybrid Turbo (500–650+ bhp)
For customers who want serious performance.
Typical Stage 2+ mods:
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Hybrid turbo upgrade
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Upgraded HPFP
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Larger intercooler
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Water/meth injection (optional but effective)
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Full supporting mods
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Custom tune
Expected power: 500–650bhp depending on turbo and fueling.
Hybrid and big-power setups vary from car to car.
Message us with your registration number, turbo choice and power goal for a tailored recommendation.
Recommended Brands
We stock trusted, proven brands for the B58 platform:
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VRSF
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RDM Performance Turbos
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MST
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Forge Motorsport
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Tial
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Torefi Sport
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NGK
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Torefi Coils
Expected Gains
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Stage 1: +40–60bhp
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Stage 2: +80–120bhp
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Hybrids: +150–250bhp
Why Choose RDM Performance?
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Specialists in BMW tuning platforms including N54, N55, B58, S55, S58, B48 and more
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Fast UK delivery with reliable shipping and real-time order updates
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Carefully selected brands that we trust and use on our own vehicles
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Clear, honest advice — no upselling, no pressure
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Proven power upgrade paths with safe, reliable recommendations
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Excellent customer support through Instagram, WhatsApp and email
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UK-based business focused on quality, value and customer satisfaction
Disclaimer:
All performance figures are estimates and will vary depending on vehicle condition, supporting modifications, fuel quality, tuning software and installation quality. Some upgrades, such as decat downpipes, are not road legal in the UK and are intended for off-road or track use only.RDM Performance uk ltd is not responsible for any mechanical issues that arise from improper installation, aggressive tuning or pre-existing vehicle faults.For best results, always use a reputable tuner and ensure your vehicle is well-maintained.
