Description
The MST BMW B58 Gen2 Turbo Inlet Pipe Kit is a high-flow, OEM-style upgrade engineered to remove one of the most restrictive components in the factory B58 intake system. Designed for BMW and Toyota vehicles equipped with the Gen2 B58 3.0L turbocharged inline-six engine, this inlet pipe dramatically improves airflow to the turbocharger while retaining full compatibility with the factory airbox.
On tuned B58 engines, this upgrade delivers proven gains of 10–14 horsepower, along with faster turbo spool, sharper throttle response, and improved overall drivability. Even on stock vehicles, drivers will notice reduced turbo lag and smoother power delivery.
Unlike generic intake solutions, the MST inlet pipe is designed as a direct OEM-style replacement. It installs without modification, maintains factory mounting points, and supports both stock and upgraded turbochargers, making it an ideal foundation for any B58 performance build.
Key Performance Benefits
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10–14 horsepower gains on tuned B58 engines
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Faster turbo spool and reduced turbo lag
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Improved throttle response and acceleration
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Increased airflow capacity compared to OEM inlet
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Supports higher horsepower and boost levels
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Direct bolt-on installation with factory airbox
Engineering & Design Features
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Enlarged internal diameter compared to the restrictive OEM inlet
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Optimized airflow path for improved turbo efficiency
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OEM-diameter turbo guide vane for proper compressor compatibility
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Designed specifically for Gen2 B58 engines
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Fully compatible with the factory BMW airbox
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Works with both stock and upgraded turbochargers
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Precision-engineered by MST Performance
Why Upgrade the Factory B58 Turbo Inlet Pipe
The OEM B58 turbo inlet pipe was designed to meet cost, packaging, and emissions requirements rather than maximize airflow. As power demands increase, the factory inlet becomes a bottleneck that limits turbo efficiency and overall performance.
Common limitations of the stock inlet include:
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Restricted airflow under higher boost from ECU tuning
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Increased turbo lag during acceleration
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Reduced efficiency at high RPM
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Higher intake temperatures under load
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Inability to support upgraded turbochargers
The MST turbo inlet pipe eliminates these issues by allowing the turbocharger to draw air freely, reducing workload on the turbo and unlocking the engine’s true potential.
Real-World Performance Improvements
Horsepower Gains
Tuned B58 engines consistently see gains of 10–14 HP at peak power by eliminating intake restriction and improving turbo efficiency.
Faster Turbo Spool
The enlarged inlet diameter allows boost to build more quickly, delivering noticeably quicker response during acceleration.
Improved Throttle Response
Reduced restriction results in more immediate reaction to throttle inputs, especially during part-throttle and mid-range driving.
Lower Intake Temperatures
Improved airflow allows the turbocharger to operate more efficiently, often resulting in slightly reduced intake air temperatures.
Supports High-Power Builds
The MST inlet provides sufficient airflow capacity for builds exceeding 500 horsepower, ensuring it won’t become a limiting factor as modifications increase.
Technical Specifications
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Part Number: MST-BW-B5806H
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Application: BMW B58 Gen2 3.0L Turbo Engine
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Design: OEM-Style Direct Replacement
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Airbox Compatibility: Factory / OEM Airbox Only
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Turbo Compatibility: Stock and Upgraded Turbos
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Diameter: Enlarged vs OEM
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Guide Vane: OEM-Diameter Optimized Flow
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Material: High-Quality Polymer
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Finish: Black
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Installation: Direct Bolt-On
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Included Components: Turbo inlet pipe and required hardware
Installation Information
Installation Difficulty
Straightforward bolt-on installation suitable for basic mechanical skill levels.
Estimated Install Time
Approximately 1–2 hours.
Tools Required
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Metric socket set
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Screwdrivers
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Pliers
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Torque wrench recommended
Professional Installation
Professional installation is optional and typically requires 1–1.5 hours at a performance or tuning shop.
Fitment Information
The MST BMW B58 Gen2 Turbo Inlet Pipe Kit is compatible with the following vehicles equipped with the Gen2 B58 3.0L Turbo Inline-Six engine and factory OEM airbox:
BMW 330i / 340i / M340i
Chassis Codes: G20, G21
Engine: B58 3.0L Turbo I6
Model Years: 2019–2025
BMW 430i / 440i / M440i
Chassis Codes: G22, G23
Engine: B58 3.0L Turbo I6
Model Years: 2021–2025
BMW M240i
Chassis Code: G42
Engine: B58 3.0L Turbo I6
Model Years: 2022–2025
BMW Z4 M40i
Chassis Code: G29
Engine: B58 3.0L Turbo I6
Model Years: 2019–2025
Toyota GR Supra 3.0
Chassis Codes: A90, A91
Engine: B58 3.0L Turbo I6
Model Years: 2020–2025
Important Fitment Note
This inlet pipe is designed exclusively for Gen2 B58 engines using the factory OEM airbox. Vehicles equipped with aftermarket intakes or custom airbox systems may require additional verification for compatibility.
