Increase the displacement and power potential of your BMW B58 from 3.0L to 3.2L with the ItalianRP B58 Stroker Kit.
Built around a custom long-stroke billet steel crankshaft and matched ItalianRP forged internals, this complete rotating assembly is designed for high-boost, high-horsepower B58 engine builds.
Choose between the Gold Line for high-horsepower street, drag and track builds or the Platinum Line for extreme-power, high-RPM competition applications.
Required Configuration
Please select your performance tier before adding to cart.
Kit Tier:
What's Included
Each ItalianRP B58 3.2L Stroker Kit includes a matched rotating assembly:
- 1x Billet Steel Stroker Crankshaft - Custom extended-stroke design for 3.2L displacement
- 6x ItalianRP Forged Pistons
- 6x ItalianRP Forged Connecting Rods
- Heavy-duty wrist pins
- Performance piston ring packs
- Wire locks
- High-strength connecting rod bolts
- Assembly lubricant
Gold Line - High-Horsepower Street & Track
Designed for forced-induction B58 builds targeting approximately 1,000-1,400 WHP.
Gold Line Pistons
- 2618-T6 forged aluminum
- Fully CNC-machined
- Double-bridge structural architecture
- Galvanic coating across the piston crown and upper ring grooves for additional protection against extreme combustion temperatures
Gold Line Connecting Rods
- ItalianRP proprietary 34CrNiMo6 steel
- 44-46 HRC hardness
- ItalianRP states approximately 20% greater strength than conventional 4340 chromoly
- ItalianRP 2500 Series high-tensile rod bolts
The Gold Line is aimed at serious street, roll-racing, drag and weekend track builds where high power capability and durability are the priorities.
Platinum Line - Extreme Power & High-RPM Competition
Designed for extreme B58 builds targeting 1,500+ WHP where reduced reciprocating mass and maximum component strength become increasingly important.
Platinum Line Pistons
- Skeletonized 2618 aircraft-grade billet aluminum
- Weight-reduced construction
- Triple-bridge internal architecture
- Lateral gas porting to improve ring sealing under high cylinder pressure
- Multilayer galvanic thermal-barrier crown coating
Platinum Line Connecting Rods
- Ultra-pure 35NCD16 motorsport-grade steel
- Cryogenically treated
- 55 HRC hardness
- ItalianRP-rated 2,100 MPa yield strength
- Approximately 20% lower reciprocating mass than Gold Line rods
- ARP Custom Age 625+ rod bolts
Platinum Line Documentation
- Certified material-quality documentation
- Exact component mass documentation
Why Build a 3.2L B58?
The B58 already responds exceptionally well to increased boost, fueling and turbo upgrades. Increasing displacement to 3.2 liters adds another tool to the engine builder's arsenal.
The additional displacement can increase torque and airflow potential while allowing the complete engine combination to be designed around the desired turbocharger, fuel, boost level and RPM range.
This isn't simply a piston-and-rod upgrade. The ItalianRP 3.2L package replaces the factory rotating assembly with a purpose-built stroker combination centered around a billet steel crankshaft.
BMW B58 Vehicle Fitment
Designed for BMW applications equipped with compatible B58 3.0L turbocharged inline-six engines.
Common B58 applications include:
BMW 2 Series
- F22/F23 M240i
- G42 M240i xDrive
BMW 3 Series
- F30/F31/F34 340i
- G20/G21 M340i / M340i xDrive
BMW 4 Series
- F32/F33/F36 440i
- G22/G23/G26 M440i / M440i xDrive
BMW 5 Series
- G30/G31 540i / 540i xDrive
BMW 7 Series
BMW 8 Series
- G14/G15/G16 840i / 840i xDrive
BMW X3
BMW X4
BMW X5
BMW X6
BMW X7
BMW Z4
Toyota
Important: B58 engines exist in multiple generations and technical revisions. Confirm the exact engine version, crankshaft compatibility and required bore/configuration with VAC Motorsports before ordering.
Recommended Applications
Ideal for:
- High-horsepower B58 street builds
- Drag racing
- Roll racing
- Time attack and track builds
- Big-turbo B58 applications
- A90/A91 Supra engine builds
- Maximum-effort competition engines
Need Help Building Your 3.2L B58?
A 3.2L stroker build should be engineered as a complete engine combination. Turbocharger sizing, compression ratio, fueling, cylinder-head configuration, block preparation, engine management and intended RPM range all affect the final specification.
VAC Motorsports can help you select the correct ItalianRP configuration and build the rest of the B58 engine around your horsepower target.