Spool Performance B58 Engine Build SP-B58-REB

Spool Performance BMW B58 Engine Build Program

The Spool Performance B58 Engine Build Program was developed to meet the growing demand for properly engineered, high-horsepower engine solutions—built with the same precision, durability, and attention to detail that defines every Spool product.

For years, complete engine builds were offered only to select clients. After supporting numerous B58 builds—many recovering from failures caused by poor component selection or subpar assembly—we are now making this program publicly available.

This is not a budget build service.
This is a no-compromise approach to building a B58 capable of real power and long-term reliability.

Built for Real Power — Not Just Numbers

Modern B58 platforms are regularly pushed into the 800–1500+ WHP range, where factory limitations quickly surface—especially in:

• Head gasket sealing
• Fastener strength
• Cylinder pressure containment
• Long-term thermal stability

Our builds address these failure points directly with proven components and precise machining, ensuring the engine can withstand sustained high boost and real-world abuse—not just dyno pulls.

Engineered for Reliability Under Load

Every engine is assembled with a focus on:

• Tight tolerances and precision measurement
• Proper cylinder sealing under extreme pressure
• Stable valvetrain operation at high RPM
• Long-term durability under repeated load cycles

This results in an engine that delivers consistent, repeatable performance on the street, track, or drag strip.

Stage 2 Build — Rated Up To 1200HP

Designed as the foundation for serious performance builds, Stage 2 represents the minimum level we recommend for high-boost B58 setups.

Includes:

• CP Carrillo Race Pistons with Heavy-Duty Wrist Pins
• CP Carrillo Race Rods with Upgraded Bolts
• ARP Custom Age 625+ Head Studs
• ARP 2000 Main Studs
• Spool Race Rod Bearings and Main Bearings
• OEM Head Gasket with Spool Fire Rings
• Upgraded ARP Hardware (Oil Pump, Girdle, Pulley)
• Custom CNC + Hand Cylinder Head Porting
• GSC S2 Camshafts
• GSC Valve Springs with Titanium Retainers
• GSC Valves

Stage 3 Build — Rated Up To 1500HP

For extreme builds targeting maximum output, Stage 3 pushes the platform to its highest potential with upgraded internals and enhanced sealing capability.

Includes:

• Italian RP Platinum Line Pistons with Heavy-Duty Wrist Pins
• Italian RP Platinum Line Rods with Upgraded Bolts
• ARP Custom Oversized Head Studs
• ARP 2000 Main Studs
• Spool Race Rod Bearings and Main Bearings
• OEM Head Gasket with Spool Fire Rings
• Upgraded ARP Hardware (Oil Pump, Girdle, Pulley)
• Custom CNC Cylinder Head Porting
• GSC S2 or S3 Camshafts (Customer Selection)
• GSC Valve Springs with Titanium Retainers
• GSC Valves

Available Upgrades

• 3.2L Stroker Kit
• 3.4L Stroker Kit

Built Engines Require Proper Care

High-performance engines operate under significantly greater stress than factory units. While engineered for durability, they require:

• Proper tuning
• Quality fuel
• Regular maintenance and inspection

Periodic refresh intervals will vary depending on usage and power level.

FITMENT

Compatible with vehicles equipped with the BMW B58 engine, including but not limited to:

• BMW M240i / M240i xDrive
• BMW 340i / 340i xDrive
• BMW 440i / 440i xDrive
• BMW 540i / 540i xDrive
• BMW M340i / M440i
• BMW X3 M40i / X4 M40i
• BMW X5 40i / X6 40i / X7 40i
• BMW 740i / 840i
• Toyota Supra (A90 / A91)

Note: 'New' merchandise may be returned for exchange or refund within 15 days from the date of shipment. 'New' merchandise must be unused and free from installation or mounting damage. Installation or modification of parts waives your right to returns, refunds, or exchanges.