CarBahn B58 Performance Engines
Whether you are building a sharper street car, a higher-power daily driver, or a more serious performance package, CarBahn B58 engines are engineered to give you a stronger foundation with the refinement, durability, and proven expertise expected from Steve Dinan and the CarBahn team.
Free Engine Consultation
Tell us about your build goals
to speak directly with an engine specialist.
Proven BMW Performance
Built on decades of BMW engine development and tuning expertise led by Steve Dinan, delivering performance you can trust on the street or under load.
Built Around Your Build
Every B58 engine is configured to your power goals, turbo setup, fuel type, and driving style—from refined daily drivers to high-output builds.
Precision Hand Assembly
Each engine is hand-assembled by experienced builders using carefully selected internal components designed for durability, consistency, and repeatable performance.
Choosing the Right B58 Engine Build
Not every B58 build needs the same level of reinforcement. Your power goals, turbo setup, fuel type, and how you actually drive the car all play a role in determining the right engine configuration.
In this video, Steve Dinan walks through how we approach engine development at CarBahn and how to think about selecting the right build — whether you're upgrading a daily driver or planning for higher horsepower.
If you're unsure where your build should land, our team can help you map out the right path.
Speak With an Engine SpecialistChoosing The Right B58 Build Path
Rather than thinking in fixed stages, we recommend thinking about how you actually want to use your B58. Most builds fall into three lanes: OEM+ for refined performance, Street for higher-output street builds, and Race for maximum power and extreme applications.
Final build recommendations should always be based on your turbo system, fuel type, intended use, and overall build plan. Every CarBahn B58 engine starts with a consultation to ensure the right configuration.
B58 Engine Lineup
Choose from CarBahn’s street-focused and race-focused B58 engine configurations below. Equivalent RWD and xDrive variants are grouped together where the engine package and price are the same.
Street Engines
Designed for high-performance road cars with stronger power capability, refined drivability, and the component upgrades needed to support real-world use.
B58 Street OEM+
Rated up to 700 HP / 600 WTQ
Available for B58B30A, B58B30B, and B58B30C in both RWD and xDrive applications.
- Forged connecting rods
- High-performance valve springs
- High-performance head studs
- Built for strong street performance with OEM+ character
B58 Street S2
Rated up to 850 HP / 750 WTQ
Available for B58B30A, B58B30B, and B58B30C in both RWD and xDrive applications.
- Forged pistons with offset wrist pins
- Forged connecting rods
- High-performance valve springs
- High-performance head studs
- For customers targeting serious street power with upgraded turbo capability
Race Engines
Built for maximum-output B58 applications where cylinder pressure, sustained load, and race-oriented component selection matter more than street-car compromise.
B58 Race R1
Rated 1000+ HP / 1000+ WTQ
Available for B58B30A, B58B30B, and B58B30C in both RWD and xDrive applications.
- Forged pistons with centered wrist pins
- Forged connecting rods
- Racing valve springs
- Racing head and main studs
- Racing head gasket with lowered compression
B58 Race R2
Rated 1000+ HP / 1000+ WTQ
Available for B58B30A, B58B30B, and B58B30C in both RWD and xDrive applications.
- R1 forged rotating assembly foundation
- Racing valve springs
- Racing head and main studs
- Racing head gasket with lowered compression
- Racing camshafts
B58A
Core: $8,000 | Refresh Kit: $3,695B58B30A engine builds use an $8,000 engine core value. The B58A refresh kit is $3,695 and should be considered when the surrounding wear components need to be brought up to the standard of the new build.
B58B / B58C
Core: $9,000 | Refresh Kit: $2,895B58B and B58C engine builds use a $9,000 engine core value. The B58B/B58C refresh kit is $2,895 and is recommended when mileage and wear make it smart to service adjacent components during the build process.
What Cars Use The B58 Engine?
The BMW B58 is one of the most versatile turbocharged inline-six engines in the modern BMW lineup, powering everything from rear-wheel-drive sport sedans to xDrive coupes, SUVs, and Toyota’s GR Supra. Below is a broad fitment guide for many of the most common B58-powered applications supported by CarBahn engine programs.
BMW 2 / 3 / 4 Series
- 2020–present G20 M340i / M340i xDrive
- 2021–present G22 / G23 M440i / M440i xDrive
- 2017–2021 F22 / F23 M240i
- 2022–present G42 M240i xDrive
BMW 5 / 6 / 7 / 8 Series
- 2017–present G30 540i / 540i xDrive
- 2018–present G32 640i xDrive Gran Turismo
- 2016–present G11 / G12 740i / 740Li
- Select B58-powered 8 Series applications by market
BMW X Models
- 2018–present G01 X3 M40i
- 2019–present G02 X4 M40i
- 2019–present G05 X5 xDrive40i
- 2019–present G06 X6 xDrive40i
- 2019–present G07 X7 xDrive40i
Toyota GR Supra
- 2020–present A90 / A91 Toyota GR Supra 3.0
B58 fitment can vary by generation, market, drivetrain, and engine revision including B58A, B58B, and B58C. If you are unsure which B58 variant your vehicle uses, contact our team with your VIN and build goals and we will help confirm the right path.
Why CarBahn B58 Engines
These are not generic crate engines built around a one-size-fits-all formula. Every CarBahn B58 build is configured around the intended use of the car, target power level, turbo system, fuel type, and long-term durability expectations.
BMW Performance Expertise
Every CarBahn engine is built using decades of BMW engine development experience led by Steve Dinan, with a process shaped by both performance street applications and motorsport engineering.
Built For Your Application
From OEM+ street builds to 1000+ horsepower race configurations, each engine package is matched to a defined power target, supporting hardware strategy, and real-world use case.
Consultation Before Order
We review your vehicle configuration, fuel system, turbo setup, intended use, and core strategy before finalizing the right engine path so the build matches the application.
Engine Warranty & Additional Information
CarBahn B58 engines are engineered to support substantial power increases while maintaining durability. Long-term reliability depends heavily on the calibration, torque load, fuel system, and supporting components used with the engine package.
OEM+ and S2 Engines with CarBahn Software
All OEM+ and S2 B58 engines are designed as road car engine packages and are covered for 2 years or 24,000 miles, provided the engine is running a CarBahn tune and no other vehicle components have caused a premature failure.
OEM+ and S2 Engines with Another Company's Tune
OEM+ and S2 engines remain covered for 2 years or 24,000 miles provided the engine remains below the recommended torque limits listed on the product page. Failures caused by the tune, aftermarket fuel injection systems, or other supporting components are not covered.
If torque limits are exceeded, warranty coverage applies only to materials and workmanship. CarBahn retains sole discretion in determining the cause of failure.
Race Engines
Race R1 and Race R2 engines are designed for competition environments and are covered for materials and workmanship only. Racing engines should be periodically rebuilt based on runtime, operating conditions, or mileage.
Warranty does not cover failures caused by tuning, fuel systems, or other aftermarket components. CarBahn retains full discretion in determining the cause of failure.
Engine Core Acceptance Parameters
All engines supplied for rebuilding must be a complete factory core from oil pan to valve cover.
Block Requirements
- No holes or cracks in casting
- No holes or cracks in covers
- No bore damage that cannot be honed out
- No thrust surface damage
- No journal surface damage
- No bolt hole damage that cannot be repaired
Cylinder Head Requirements
- No holes or cracks in casting
- No holes or cracks in covers
- No thrust surface damage
- No journal surface damage
- No bolt hole damage that cannot be repaired
Possible Additional Repair Charges
Additional charges may apply if the following items are damaged and cannot be serviced or repaired:
- Valves
- Crankshafts
- Camshafts
- Guides
- Valvetronic mechanism
- VANOS mechanism
RACING ENGINES MAY ALSO NOT BE LEGAL IN YOUR STATE. PLEASE CHECK WITH YOUR LOCAL LAWS PRIOR TO PURCHASE OR INSTALLATION.
Questions About The Process?
Common questions about CarBahn B58 engine builds, consultation, timelines, core requirements, and how we match the right configuration to your goals.
How do I know which B58 build is right for me? +
The right build depends on how you use the car, your target power level, turbo system, fuel type, and long-term torque load. Our consultation process helps determine whether an OEM+, S2, or Race (R1 / R2) engine is the best fit.
Do I need to send in my original engine core? +
In most cases, yes. If you are supplying a usable core, a deposit is required to begin work. Once your engine is received and inspected, that deposit is either applied to the purchase price or used to cover any required machining or replacement parts.
If you prefer, CarBahn can also supply a replacement core based on current availability and pricing.
What happens if my engine core has damage? +
Your core must meet CarBahn’s acceptance standards. If inspection reveals damage requiring machining or replacement parts beyond a standard rebuild, those costs are applied accordingly.
Common additional-charge items include valves, crankshafts, camshafts, guides, Valvetronic components, and VANOS components.
How long does a B58 engine build take? +
Build timing depends on configuration, parts availability, machine work requirements, and production scheduling. Higher-output and race builds typically require more time.
The best way to get an accurate timeline is to submit the consultation form or call our team directly.
Do I need the refresh kit? +
The Refresh Kit is typically required for higher-mileage engines and recommended for builds where surrounding components should be brought up to the same standard as the new internal assembly.
What tune should I run? +
For the strongest warranty position and optimal calibration, we recommend running a CarBahn tune.
Other tunes may be used, but must remain within recommended torque limits. Failures caused by tuning or supporting fuel components are not covered.
Are race engines covered under warranty? +
Race engines are covered for materials and workmanship only and are designed for competition use. They should be serviced or rebuilt periodically based on runtime and usage.
Can I run a race engine on the street? +
Race engine configurations may not be legal for use on public roads depending on your location. Always check local regulations and consult with our team before selecting a race configuration for a street-driven vehicle.
Still have questions? Submit the consultation form or call (866) 558-4314 x1 to speak with an engine specialist.