Carrillo SCR15003-6 Pro-H Forged Connecting Rods 3/8 CARR for BMW S58 M3/M4 3.0L

Vehicle Fitment

• 2021-2026 BMW M3 / M3 Competition / M3 CS (G80/G81, 3.0L I6 Twin-Turbo S58B30, RWD/AWD)
• 2021-2026 BMW M4 / M4 Competition / M4 CSL / M4 CS (G82/G83, 3.0L I6 Twin-Turbo S58B30, RWD/AWD)
• 2023-2026 BMW M2 (G87, 3.0L I6 Twin-Turbo S58B30, RWD)
• 2019-2026 BMW X3 M / X3 M Competition (F97, 3.0L I6 Twin-Turbo S58B30, AWD)
• 2019-2026 BMW X4 M / X4 M Competition (F98, 3.0L I6 Twin-Turbo S58B30, AWD)
• 2023 BMW 3.0 CSL (G82, 3.0L I6 Twin-Turbo S58B30, RWD)
• 2019-2022 BMW Alpina B3 (G20/G21, 3.0L I6 Twin-Turbo S58B30, AWD)
• 2022-2026 BMW Alpina B4 Gran Coupe (G26, 3.0L I6 Twin-Turbo S58B30, AWD)

Fitment Notes

• Designed specifically for the BMW S58B30 3.0L twin-turbocharged inline-6 engine - sold as a set of 6 connecting rods
• Not compatible with the BMW B58 engine - different bore, stroke, and rod journal dimensions despite shared architecture
• Fits all S58 power variants including base (453 HP), Competition (503 HP), CSL (543 HP), and CS (552 HP)
• 23mm wrist pin bore, bushed for full-floating operation
• Requires professional engine assembly by a qualified builder

Features

• Carrillo Pro-H beam design - the gold standard in high-performance H-beam connecting rods for extreme horsepower applications
• Manufactured from Carrilloy proprietary chrome-nickel-moly-vanadium alloy steel meeting all VAR (vacuum arc re-melt) ASTM standards
• Mar-aged heat treatment achieves ultimate tensile strength of 195,000 PSI with yield of 182,000 PSI while maintaining low notch-sensitivity and ductility
• 3/8" CARR Multiphase rod bolts rated for indefinite torque cycles using the stretch installation method
• 23mm wrist pin bore bushed for full-floating operation, reducing friction and enabling smooth pin rotation at high RPM
• 100% magnaflux inspected and hardness checked after heat treatment
• Manufactured from oversized proprietary steel forgings for proper grain flow and guaranteed surface inclusion removal
• Each set of 6 matched and balanced for consistent cylinder-to-cylinder performance
• Shot peened for ultimate fatigue resistance
• Proudly manufactured in the USA

Specifications

• Part Number: SCR15003-6
• Engine Application: BMW S58B30 3.0L Twin-Turbo I6
• Rod Length: 5.157" (131mm) center-to-center
• Rod Journal Diameter: 2.110"
• Rod Beam Style: Pro-H (H-Beam)
• Rod Material: Carrilloy Forged Steel (Chrome-Nickel-Moly-Vanadium)
• Rod Bolt: 3/8" CARR Multiphase
• Wrist Pin Diameter: 23mm (.906") bushed, full-floating
• UTS: 195,000 PSI
• Yield: 182,000 PSI
• Set Quantity: 6 Connecting Rods

Included Components

• 6x Carrillo Pro-H Forged Connecting Rods
• 6x 3/8" CARR Multiphase Rod Bolts (installed)
• 6x Wrist Pin Bushings (23mm, installed)

Product Description

The Carrillo SCR15003-6 is a set of 6 Pro-H beam forged connecting rods engineered for the BMW S58B30 3.0L twin-turbocharged inline-6 engine - BMW M Division's most powerful production inline-6 and the powerplant behind the G80 M3, G82 M4, G87 M2, and the F97/F98 X3 M and X4 M. With a center-to-center length of 5.157", a 2.110" rod journal diameter, and a 23mm bushed full-floating wrist pin bore, these rods are a direct replacement for the factory connecting rods and provide a massive strength upgrade for builders seeking to push the S58 well beyond its factory power output of up to 552 horsepower in CSL/CS trim.

Every Carrillo Pro-H rod is manufactured from Carrilloy - a proprietary chrome, nickel, moly, vanadium alloy steel that undergoes vacuum arc re-melting and mar-aged heat treatment to achieve an ultimate tensile strength of 195,000 PSI and a yield strength of 182,000 PSI. The 3/8" CARR Multiphase rod bolts are rated for indefinite torque cycles when installed using the stretch method with recommended lube - a significant advantage over H11 tool steel fasteners. Each rod is 100% magnaflux inspected, hardness checked, and shot peened after heat treatment for maximum fatigue resistance. The entire set of 6 is matched and balanced for smooth, consistent operation across all six cylinders.

The S58 engine has rapidly become one of the most popular platforms for high-performance tuning, with the aftermarket supporting everything from hybrid turbo upgrades to full single-turbo conversions capable of 1,000+ horsepower. Professional engine builders like CarBahn (Steve Dinan) specifically use Carrillo connecting rods in their high-output S58 engine builds for applications rated up to 1,000 lb-ft of torque. Whether you are building a big-turbo M4, upgrading an X3 M Competition with forged internals for long-term reliability under increased boost, or assembling a dedicated race engine for time attack or endurance competition, the SCR15003-6 delivers the Carrillo-quality strength, precision, and fatigue resistance that the S58 platform demands at serious power levels.