The BMW B58 Engine: A Modern Classic for Performance Enthusiasts
BMW’s B58 engine has rapidly become one of the most celebrated inline-six powerplants in modern performance car history. Introduced in 2015 as part of BMW’s modular engine lineup, the B58 was the successor to the N55, but it offered significant refinements in power delivery, efficiency, and tuning potential. It’s now a cornerstone of BMW’s performance lineup, delivering dynamic driving experiences in models like the M340i, X3 M40i, and the Toyota GR Supra.
BMW B58 Engine Specifications
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Configuration: 3.0L Inline-6 Turbocharged
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Displacement: 2,998 cc
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Induction: Twin-scroll single turbocharger
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Fuel System: High-precision direct fuel injection
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Valvetrain: DOHC with VANOS & Valvetronic
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Max Output: Up to 382 HP (US) / 500 Nm (369 lb-ft)
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Compression Ratio: 11.0:1
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Cooling: Liquid-cooled with integrated heat management
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Emissions: Euro 6 compliant (depending on region)
B58-Equipped BMW and Toyota Models
The B58 engine powers a wide variety of high-performance and luxury BMW vehicles, including:
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BMW 340i (F30/F31)
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BMW 440i (F32/F33)
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BMW 540i (G30)
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BMW 740i / 745e
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BMW Z4 M40i (G29)
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BMW X3 M40i / X4 M40i
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BMW M240i (F22)
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Toyota GR Supra (A90/A91)
Why the BMW B58 Engine is Ideal for Tuning
Performance potential is where the B58 shines. With a forged crankshaft, closed-deck block, and high-flow head design, this engine was built with strength in mind. Enthusiasts have seen substantial gains with basic bolt-ons and ECU tunes, often pushing the engine into the 450–500+ HP range reliably.
Key reasons the B58 is tuner-friendly:
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Robust internals handle high boost
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Strong aftermarket ECU tuning support (Bootmod3, MHD, EcuTek)
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Excellent turbocharger response
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Efficient intercooling and fuel delivery systems
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Wide platform compatibility across BMW & Toyota models
Top Performance Upgrades for the BMW B58 Engine
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Cold Air Intake Upgrade
One of the simplest yet most impactful upgrades, a high-performance B58 cold air intake improves throttle response and adds a more aggressive induction note.
Key Features:
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Increased airflow and filtration
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Horsepower and torque gains (typically +5–10 HP)
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Engine bay aesthetics and sound enhancement
Top Brands: MST Performance, Eventuri, CTS Turbo
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BMW B58 Downpipe Upgrade
Upgrading to a high-flow or catless downpipe unlocks faster turbo spool, higher exhaust flow, and an aggressive exhaust tone.
Benefits:
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Gains of +15–30 HP with a tune
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Enhanced turbo efficiency
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Prepares the system for bigger power upgrades
Pro Tip: Pair with a tune to avoid check engine lights and maximize gains.
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Intercooler Upgrade
The factory intercooler can heat-soak under aggressive driving or high boost. An upgraded unit keeps intake temps down and power consistent.
Advantages:
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Improved heat dissipation
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Sustained power in track or summer driving
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Bolt-on fitment for most models
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ECU Tune (Stage 1, 2, or Custom)
The cornerstone of B58 performance tuning. A flash tune optimizes boost pressure, ignition timing, and fuel delivery.
Popular Options: Bootmod3, MHD, JB4 (Piggyback)
Typical Gains:
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Stage 1: +60–80 HP
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Stage 2 (with DP): +100+ HP
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E85 tunes: Even greater gains with flex-fuel capability
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Upgraded Radiator
An essential mod for reliability. High-capacity radiators maintain engine temps during track days or spirited street driving.
Why it Matters:
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Reduces risk of overheating
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Extends engine life under load
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Supports higher-output builds
Advanced Modifications for Power Builds
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Turbocharger Upgrade: Hybrid or full-frame turbo kits push the B58 to 600+ HP.
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Port Injection Kits: For those going full E85 or needing more fuel delivery.
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Methanol Injection: Helps with cooling and octane boosting under high boost conditions.
B58 Engine Subcategories (Under BMW Engines):
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BMW Inline-Six Turbo Engines
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B58 Engine Parts & Upgrades
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Cold Air Intakes for B58
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B58 Downpipes & Exhaust Mods
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B58 Tuning Tools & Software
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B58 Cooling System Upgrades
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B58 Performance Packages
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BMW B58 Maintenance Kits
Reliability of the B58 Engine
Despite its performance credentials, the B58 engine is also known for its reliability. It has proven more durable than its predecessor (N55), with fewer common issues and excellent longevity when properly maintained. Most problems arise only when aftermarket tuning is done carelessly or without supporting mods.
Maintenance Tips:
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Use high-quality 0W-20 or 5W-30 synthetic oil (BMW LL-17FE+ approved)
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Regularly inspect cooling system components
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Replace spark plugs every 30,000–40,000 miles under tuned conditions
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Monitor boost and AFRs with a proper OBD tool or tuning app
Conclusion: The Ultimate BMW Tuning Platform
The BMW B58 engine delivers thrilling power, precision engineering, and exceptional tuning flexibility. Whether you’re adding a cold air intake for a modest bump or aiming for a 600+ HP street weapon with turbo and fueling upgrades, the B58 gives you the foundation to build your perfect BMW.
From factory refinement to full race builds, the B58 continues to define what it means to drive the Ultimate Driving Machine.
Ready to upgrade your B58? Check out our full range of BMW performance parts and expert-recommended tuning kits.