MST
MST BMW B58 Gen2 Turbo Inlet Pipe Kit - High-Flow OEM-Style Upgrade
MST BMW B58 Gen2 Turbo Inlet Pipe Kit - High-Flow OEM-Style Upgrade
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Maximum Airflow for Your B58 Engine
The BMW B58 engine is a powerhouse, but the factory turbo inlet pipe is a significant restriction that limits your engine's true potential. Whether you're running a stock M340i, tuned M240i, or modified Supra 3.0, the restrictive OEM inlet diameter creates a bottleneck that prevents your turbocharger from receiving the volume of air it needs to perform at its best.
MST Performance has engineered the solution. The MST B58 Gen2 Turbo Inlet Pipe Kit features an enlarged diameter design that dramatically increases airflow to your turbocharger. This isn't just a marginal improvement - it's a fundamental upgrade that transforms how your B58 breathes, resulting in measurable power gains, faster turbo spool, and noticeably sharper throttle response.
Designed specifically for enthusiasts running the OEM airbox setup, this inlet pipe integrates seamlessly with your stock air intake system while delivering the increased airflow capacity needed to support higher horsepower levels. It's the perfect foundation for any B58 performance build.
Engineering Excellence: What Sets the MST Inlet Apart
Enlarged Diameter Design
Significantly larger internal diameter compared to the restrictive OEM pipe. This increased volume allows substantially more air to reach the turbocharger, especially beneficial on tuned engines making higher boost levels.
OEM-Diameter Turbo Guide Vane
Features an optimized turbo guide vane that maintains OEM sizing for perfect compressor wheel compatibility while maximizing airflow efficiency through the transition.
Stock Airbox Compatible
Designed specifically to work with your factory BMW airbox. Maintains all OEM mounting points and connections for hassle-free installation without modifications.
Upgraded Turbo Ready
Compatible with both stock turbos and popular upgraded turbochargers. The increased flow capacity supports higher horsepower builds without becoming a restriction.
Proven Power Gains
Delivers 10-14 horsepower gains on tuned B58 engines. Even stock vehicles see improved throttle response and faster turbo spool characteristics.
Premium Construction
Built to MST's exacting quality standards with durable materials and precision manufacturing. Designed to handle the demands of high-performance driving.
Why the Factory B58 Inlet Pipe Limits Performance
BMW engineers prioritized cost, packaging constraints, and emissions compliance over maximum performance when designing the B58 inlet system. While adequate for stock power levels, the OEM turbo inlet pipe becomes a significant restriction under the following conditions:
- ECU Tuning: When you increase boost pressure with a tune, the turbo needs to move significantly more air. The stock inlet can't flow enough volume, limiting power gains
- High RPM Operation: At peak RPM, the turbo is spinning at maximum speed and demanding maximum airflow. The restrictive inlet creates a bottleneck
- Modified Turbos: Upgraded turbochargers can flow much more air than stock, but they can't reach their potential with the factory inlet restriction
- Heat Soak: Restricted airflow can contribute to higher intake temperatures as the turbo works harder to compress less air
- Turbo Lag: The restriction increases the time it takes for the turbo to build boost, resulting in noticeable lag during acceleration
The MST turbo inlet pipe eliminates this restriction entirely. The enlarged diameter allows your turbocharger to breathe freely, reducing the work required to build boost, lowering intake temperatures, and unlocking the full potential of your B58 engine.
Fitment Guide - Compatible Vehicles
The MST B58 Gen2 Turbo Inlet Pipe is engineered for the following BMW and Toyota models equipped with the B58 engine:
| Model | Chassis Code | Engine | Years |
|---|---|---|---|
| BMW 330i / 340i / M340i | G20 / G21 | B58 3.0L Turbo I6 | 2019-2025 |
| BMW 430i / 440i / M440i | G22 / G23 | B58 3.0L Turbo I6 | 2021-2025 |
| BMW M240i | G42 | B58 3.0L Turbo I6 | 2022-2025 |
| BMW Z4 M40i | G29 | B58 3.0L Turbo I6 | 2019-2025 |
| Toyota GR Supra 3.0 | A90 / A91 | B58 3.0L Turbo I6 | 2020-2025 |
Technical Specifications
- Part Number: MST-BW-B5806H
- Application: BMW B58 Gen2 Engine
- Design: OEM-Style Direct Replacement
- Airbox Compatibility: Factory/OEM Airbox
- Turbo Compatibility: Stock and Upgraded Turbos
- Diameter: Enlarged vs OEM (Specific dimensions available)
- Guide Vane: OEM-Diameter Optimized Flow
- Material: High-Quality Polymer Construction
- Finish: Black
- Installation: Direct Bolt-On
- Included: Complete Pipe Kit with Hardware
- Country of Origin: Quality Manufactured
Real-World Performance Improvements
Horsepower Gains
On tuned B58 engines, the MST turbo inlet pipe consistently delivers 10-14 horsepower gains at peak power. These gains come from eliminating the inlet restriction and allowing the turbocharger to operate more efficiently. The improvement is most noticeable in the mid-range and top-end of the powerband where airflow demand is highest.
Faster Turbo Spool
One of the most immediately noticeable improvements is reduced turbo lag. The enlarged diameter allows the turbo to build boost faster because it doesn't have to work as hard to pull air through a restriction. You'll feel this as quicker throttle response and a more immediate power delivery when you accelerate.
Improved Throttle Response
The reduced restriction throughout the intake path means your engine responds more eagerly to throttle inputs. The difference is particularly apparent during part-throttle acceleration and quick throttle transitions where the improved airflow helps the turbo maintain boost more effectively.
Lower Intake Temperatures
When a turbo has to work harder to compress air through a restriction, it generates more heat. The MST inlet's improved flow allows the turbo to operate more efficiently, typically resulting in slightly lower intake air temperatures which helps maintain consistent power output.
Supporting Higher Power Levels
For enthusiasts planning significant power upgrades, the MST inlet provides the airflow capacity needed to support 500+ horsepower builds. It won't become a restriction as you add more modifications, making it a smart foundation piece for any B58 performance project.
Installation Information
What's Included
- MST High-Flow Turbo Inlet Pipe
- All Required Mounting Hardware
- Installation Instructions
- Gaskets and Seals (where applicable)
Installation Difficulty
The MST turbo inlet pipe is a straightforward installation for those with basic mechanical skills and tools. The job typically takes 1-2 hours in a home garage. The inlet is designed as a direct replacement for the OEM pipe and uses all factory mounting locations.
Tools Required
- Socket set (metric)
- Screwdrivers (flathead and Phillips)
- Pliers
- Torque wrench (recommended)
- Basic hand tools
Installation Overview
Installation involves removing the factory inlet pipe from the turbocharger inlet and airbox connection, then installing the MST inlet in its place. All connections use existing mounting points and hardware. The process is similar to other intake system modifications and doesn't require special tools or skills.
Professional Installation
While this is a DIY-friendly modification, professional installation is available at most BMW performance shops or tuning shops. Typical labor time is 1-1.5 hours. Installing the inlet pipe during a tune or other performance work can save on labor costs.
Getting the Most from Your Inlet Upgrade
ECU Tuning for Maximum Gains
While the MST inlet pipe will improve airflow and response on stock vehicles, the full horsepower potential is unlocked with ECU tuning. A quality tune takes advantage of the increased airflow capacity by raising boost pressure and optimizing fuel delivery, resulting in the full 10-14 HP gains.
Complementary Modifications
The MST inlet pipe works exceptionally well as part of a complete intake system upgrade. For maximum performance, consider pairing it with:
- High-Flow Air Filter: Replace the stock paper filter with a high-flow panel filter or performance filter to further increase airflow
- Aftermarket Intake: For those willing to move beyond the OEM airbox, a full cold air intake maximizes airflow potential
- Charge Pipe Upgrade: The pipe between the turbo and intercooler is another restriction point worth addressing
- Intercooler Upgrade: Increased airflow benefits from improved cooling capacity to maintain power
- Downpipe: Reducing exhaust restriction complements the intake improvements for balanced performance
Stock Airbox Optimization
If you're keeping the OEM airbox, maximize its potential by ensuring it's properly sealed and the air filter is clean or upgraded. A high-flow panel filter like those from MST can significantly increase airflow without requiring a full intake replacement.
Understanding the BMW B58 Engine Platform
The B58 is BMW's third-generation modular turbocharged inline-six engine, representing the evolution of the legendary N55 and N54 engines. It's widely regarded as one of BMW's best engines, offering a perfect balance of performance, reliability, and tuning potential.
B58 Performance Characteristics
From the factory, the B58 produces impressive power - 382 horsepower in M variants like the M340i and Supra 3.0. But what makes the B58 truly special is its massive tuning potential. The engine's robust construction, efficient turbocharger, and advanced engine management allow it to safely handle 500+ horsepower with proper modifications and tuning.
Why the B58 Responds So Well to Intake Mods
The B58's single twin-scroll turbocharger is highly efficient but sensitive to restrictions in the intake and exhaust paths. Even small improvements in airflow can yield measurable power gains because the turbo can operate more efficiently. The factory inlet pipe, designed to meet cost and packaging requirements rather than maximum performance, represents one of the most cost-effective restriction points to address.
The B58 in the Supra
Toyota's collaboration with BMW brought the B58 to the legendary Supra nameplate. The GR Supra 3.0 shares the same fundamental B58 engine as BMW's M-cars, making modifications like the MST inlet pipe equally effective on both platforms. Supra owners have the same tuning potential and benefit from the extensive BMW aftermarket support.
Frequently Asked Questions
What is a turbo inlet pipe and why upgrade?
A turbo inlet pipe connects your air intake system to the turbocharger inlet. It's the final pipe in the intake tract before air enters the turbo compressor. The factory BMW B58 inlet pipe has a restrictive diameter that limits airflow. The MST turbo inlet pipe features an enlarged diameter that significantly improves airflow to the turbo, resulting in 10-14 HP gains on tuned vehicles, faster turbo spool, and better throttle response. It's one of the most cost-effective performance upgrades for the B58 platform.
Which BMW models does the MST B58 turbo inlet fit?
The MST B58 turbo inlet pipe fits BMW G20/G21 M340i, BMW G22/G23 M440i, BMW G29 Z4 40i, BMW G42 M240i, and Toyota Supra 3.0 (A90/A91). All of these vehicles use the B58 Gen2 turbocharged inline-six engine. The inlet is designed specifically for Gen2 B58 engines and OEM airbox configurations.
How much horsepower does the MST turbo inlet add?
On tuned BMW B58 engines, the MST turbo inlet pipe provides gains of 10-14 horsepower at peak power. These gains come from eliminating the intake restriction and allowing the turbocharger to operate more efficiently. Stock vehicles will see improved throttle response and faster turbo spool even without a tune, though measurable horsepower gains are most significant when combined with ECU tuning.
Can I use the MST inlet with the stock airbox?
Yes, the MST turbo inlet pipe is specifically designed to work with the OEM airbox. It's an OEM-style replacement that maintains compatibility with the factory air intake system while providing significantly improved flow. The inlet maintains all factory connection points and mounting locations. For best results, pair it with a high-flow panel filter or performance air filter to maximize airflow through the stock airbox.
Will this work with an aftermarket intake?
The MST inlet is designed for OEM airbox configurations. If you're running an aftermarket cold air intake or intake system, you'll need to verify compatibility as most aftermarket intakes include their own inlet piping. Contact us with details about your specific intake setup and we can help determine compatibility.
Do I need a tune to see benefits?
No, you don't need a tune to benefit from the MST inlet pipe. Even on stock vehicles, you'll notice improved throttle response and faster turbo spool due to the reduced restriction. However, the full horsepower potential (10-14 HP) is realized when combined with ECU tuning that can take advantage of the increased airflow capacity by raising boost levels and optimizing fuel delivery.
Is this compatible with upgraded turbos?
Yes, the MST turbo inlet pipe is compatible with both stock turbos and popular upgraded turbochargers for the B58. The enlarged diameter provides the flow capacity needed to support significantly higher horsepower levels, making it an excellent foundation piece for builds targeting 500+ horsepower. The OEM-diameter guide vane ensures compatibility with various turbo configurations.
Will this fit the Toyota Supra 3.0?
Yes, the MST turbo inlet pipe is fully compatible with the 2020+ Toyota GR Supra 3.0 (A90/A91 chassis). The Supra uses the same B58 engine as BMW, making it compatible with most BMW B58 performance parts. The installation process and benefits are identical to BMW applications.
How difficult is the installation?
Installation is straightforward for anyone with basic mechanical skills. The job typically takes 1-2 hours in a home garage and requires only basic hand tools. The inlet is designed as a direct replacement for the OEM pipe and uses all factory mounting locations. No cutting, welding, or permanent modifications are required.
What other mods should I do with the inlet pipe?
The MST inlet pipe works great as a standalone upgrade, but it's even more effective when combined with complementary modifications. Popular combinations include: a high-flow air filter or panel filter, charge pipe upgrade, intercooler upgrade, and downpipe. ECU tuning is highly recommended to maximize the power gains from the improved airflow.
Will this affect my warranty?
Modifications to the intake system may affect your factory warranty depending on your dealer and the specific issue. We recommend consulting with your dealer or reviewing your warranty terms. Many enthusiasts choose to wait until their warranty expires before modifying, or they install modifications like this and remove them before warranty service if needed.
Does this increase turbo noise?
The MST inlet pipe can slightly increase turbo induction and spool sounds due to the improved airflow and reduced restriction. Some enthusiasts appreciate the enhanced turbo noise as it provides audible feedback of the turbo working. The increase is generally subtle and not overwhelming.
MST Inlet vs Stock Inlet Comparison
| Feature | MST High-Flow Inlet | OEM Inlet |
|---|---|---|
| Pipe Diameter | Enlarged for maximum flow | Restrictive factory sizing |
| Airflow Capacity | Significantly increased | Limited by design |
| Power Gains (Tuned) | +10-14 HP | Baseline |
| Turbo Spool | Faster, more responsive | Stock spool rate |
| Throttle Response | Noticeably sharper | Factory response |
| High-HP Capability | Supports 500+ HP builds | Becomes restriction above stock power |
| OEM Airbox Compatible | Yes - Direct fit | Yes - Factory design |
| Installation | Direct bolt-on replacement | Factory installed |
Why Choose MST Performance?
MST Performance has built a reputation for producing high-quality, engineered solutions for performance vehicles. Their approach combines real-world testing, precision manufacturing, and attention to detail that shows in every product.
Real-World Testing
Every MST product undergoes extensive testing on actual vehicles, not just computer simulations. The B58 turbo inlet pipe was developed through iterative testing on dyno and street to optimize the design for maximum performance gains while maintaining reliability and OEM compatibility.
Quality Manufacturing
MST products are manufactured to strict quality standards using durable materials and precise processes. The inlet pipe is built to handle the demands of high-performance driving and provides long-term reliability.
Application-Specific Design
Rather than producing one-size-fits-all solutions, MST engineers products for specific applications. The B58 inlet pipe is designed exclusively for B58 Gen2 engines and OEM airbox setups, ensuring perfect fitment and optimal performance.
Track Record
MST has produced performance parts for a wide range of platforms and has proven themselves in the BMW tuning community. Their products are used by enthusiasts worldwide, from daily drivers to dedicated track cars.
Building the Ultimate B58: Modification Path
The B58 platform offers incredible tuning potential. Here's a logical progression for building power while maintaining reliability:
Stage 1: Foundation Upgrades (400-450 HP)
- MST Turbo Inlet Pipe (increases airflow)
- High-flow air filter or intake
- Charge pipe upgrade
- Stage 1 ECU tune
- Improved intercooler (recommended)
Stage 2: Enhanced Performance (450-550 HP)
- Downpipe (catted or catless)
- Upgraded intercooler (required)
- Stage 2 ECU tune
- Port injection kit (highly recommended)
- Performance transmission tune
Stage 3: Maximum Potential (550+ HP)
- Upgraded turbocharger
- Upgraded fuel system
- Custom ECU tuning
- Upgraded transmission (8HP)
- Supporting driveline upgrades
The MST inlet pipe is an essential component at every stage, providing the airflow capacity needed to support your power goals without becoming a restriction.
Maximize your B58's performance with these complementary upgrades:
- MST High-Flow Panel Air Filter for B58
- Upgraded Charge Pipe Kit
- Performance Intercooler
- Catted or Catless Downpipe
- ECU Tuning (Bootmod3, MHD, etc.)
- Transmission Tune for 8HP
Our Commitment to B58 Enthusiasts
At Kies Motorsports, we specialize in BMW performance parts because we're enthusiasts ourselves. We understand the B58 platform inside and out, from M340i daily drivers to 700+ horsepower Supra builds. We only stock products we trust and would install on our own vehicles.
The MST turbo inlet pipe represents the kind of modification that makes sense for every B58 owner - whether you're looking for subtle improvements on a stock car or building a foundation for serious power. It's a proven upgrade with measurable results, quality construction, and straightforward installation.
Our team of BMW specialists is here to help you build your perfect B58. Whether you need advice on your modification path, help with product selection, or installation support, we're just a phone call or email away.
The Smart First Modification for Any B58
If you're looking to improve your B58's performance, the MST turbo inlet pipe should be at the top of your list. It's one of the most cost-effective modifications you can make, delivering noticeable improvements in throttle response and turbo spool even on stock vehicles, with proven power gains on tuned cars.
This isn't just a bolt-on part - it's a fundamental upgrade that addresses one of the B58's few weak points from the factory. By eliminating the restrictive inlet, you're allowing your engine to breathe the way it was meant to, unlocking performance that's been there all along.
Whether you drive an M340i, M240i, M440i, Z4, or Supra 3.0, the MST inlet pipe delivers. Make the upgrade today and feel the difference every time you press the throttle.
