IRP (Italian Rods & Pistons) – Forged Piston & Connecting Rod Set

 

Performance Options

Silver Line

Up to ~1200 HP

Ideal for builds targeting up to ~1200 HP. Provides a significant strength upgrade over OEM components while maintaining excellent thermal stability and reliability.

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Gold Line

Up to ~1500 HP

Recommended for high-power builds and increased boost levels. Designed to handle higher cylinder pressure and more demanding performance applications.

 

BMW B58 Gen 1 / Gen 2 | Toyota GR Supra A90 (B58 Gen 2)

IRP (Italian Rods & Pistons) forged piston and connecting rod sets are engineered using advanced Italian manufacturing and heat treatment processes to deliver exceptional strength, precision, and reliability under high-performance conditions.

Designed for both street and high-horsepower builds, this complete rotating assembly upgrade provides the durability required for increased boost, higher cylinder pressure, and demanding performance applications.

Proven in high-performance applications worldwide, ItalianRP components have been used in some of the fastest BMW B58/S58 platform builds.

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Compatible Applications

• BMW B58 Gen 1 & Gen 2 (340i, 440i, 540i, 740i, M240i, M340i, M440i & more)

• Toyota GR Supra A90 (B58 Gen 2)

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Technical Specifications

Pistons

Silver Line

• Forged 4032 aluminum

• Double bridge design

• Bore: 82mm

• Compression Ratio: 11.0:1 (custom ratios available upon request)

• Wrist Pin Size: 0.866″

Gold Line

• Forged 2618 aluminum

• Double bridge design

• Galvanic coating on crown and ring grooves

• Compression Ratio: 11.0:1 (custom ratios available upon request)

• Wrist Pin Size: 0.866″

All Sets Include

• Upgraded heavy-duty wrist pins designed for increased strength and durability beyond typical industry standards

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Connecting Rods (All Configurations)

• Material: 34CrNiMo6 steel

• I-beam design

• Center-to-Center Length: 5.834″

• Rod Bolts: ARP Custom Age 625+

• Advanced heat treatment (Gold Line rods up to 20% stronger than traditional 4340)

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Additional Information

• Made in Italy

• Compatible with BMW B58 Gen 1 / Gen 2 and Toyota GR Supra A90

• Pistons come standard at 11.0:1 compression ratio

• Custom compression ratios available upon request

• Professional installation strongly recommended

• Proper machining, balancing, and clearances are required

• Supporting modifications and proper tuning are required for high-performance applications

  Vehicle Fitment

  BMW B58 Gen 1 Applications

  • 1 Series F20 / F21 – M140i

  • 2 Series F22 / F23 – M240i

  • 3 Series F30 / F31 – 340i / 340i xDrive

  • 3 Series F34 – 340i GT / 340i GT xDrive

  • 4 Series F32 / F33 / F36 – 440i / 440i xDrive

  • 5 Series G30 / G31 – 540i / 540i xDrive

  • 6 Series G32 – 640i GT / 640i xDrive

  • 7 Series G11 / G12 – 740i / 740i xDrive

  • X3 G01 – X3 M40i

  • X4 G02 – X4 M40i

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  BMW B58 Gen 2 Applications

  • 3 Series G20 / G21 – M340i / M340i xDrive

  • 4 Series G22 / G23 / G26 – M440i / M440i xDrive

  • Z4 G29 – Z4 M40i

  • 5 Series G30 / G31 LCI – 540i / 540i xDrive

  • 6 Series G32 LCI – 640i GT / 640i xDrive

  • 7 Series G11 / G12 LCI – 740i / 740i xDrive

  • X3 G01 – X3 M40i

  • X4 G02 – X4 M40i

  • X5 G05 – X5 xDrive40i

  • X6 G06 – X6 xDrive40i

  • X7 G07 – X7 xDrive40i

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  Toyota B58 Gen 2 Applications

  • A90 / A91 GR Supra 3.0

  • GR Supra 3.0 Premium

  • GR Supra A91 Edition

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  ALPINA B58 Gen 2 Applications

  • B3 G20 / G21

  • B4 G22

  • B5 G30

  • XB7 G07