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Supertech BMW B58 Forged 4340 H-Beam C-C Length 148.3mm Connecting Rod - Set of 6 Supertech SPTCR-MINB48-H148.3-6
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Supertech BMW B58 Forged 4340 H-Beam C-C Length 148.3mm Connecting Rod - Set of 6

Supertech
SPTCR-MINB48-H148.3-6
Connecting Rods - 6Cyl
Out of stock
$ 1,722.12 $ 1,378.08

SKU: CR-MINB48-H148.3-6

Supertech BMW B58 2016-2024 Forged 4340 H-Beam C-C 148.3mm Connecting Rod Set of 6

Supertech forged H-Beam connecting rods upgrade BMW B58 3.0L turbo engines in models like 340i, M240i, 440i, X3 M40i, and Toyota GR Supra. These rods deliver strength for high-horsepower builds up to 1200HP while reducing reciprocating weight for faster engine response. Direct OEM replacement with precise fitment ensures reliable performance in street and track applications.

Key Features

  • Forged 4340 Steel: Heat-treated aircraft-grade alloy resists fatigue and withstands extreme cylinder pressures in boosted setups
  • H-Beam Design: Optimized I-beam profile provides high strength-to-weight ratio for revs over 9000 RPM without flex
  • 148.3mm Center-to-Center Length: Matches stock B58 dimensions with BE bore 53mm, SE bore 23mm for drop-in piston compatibility
  • ARP 2000 Series Bolts: 12 included bolts rated 220ksi tensile strength with rod bolt stretch gauge for secure fastening
  • Lightweight Construction: 592g per rod reduces mass by 10% over stock for quicker acceleration and less stress on bearings

Product Notes

  • Set of 6 rods with 12 ARP bolts and rod bolt stretch gauge included
  • Rifle-drilled oil passages improve lubrication to big ends under high G-forces
  • Packaged in protective sleeves, total shipping weight 9 lbs

Installation Notes

  • Professional installation recommended.
  • Requires full engine teardown, piston removal, and rod sizing with plastigage
  • Balance rods with pistons and crank, use ARP Ultra-Torque lube on bolts

This Part Fits

Year Make Model Submodel
2016-2021 BMW 3 Series 340i
2017-2023 BMW 2 Series M240i
2016-2021 BMW 4 Series 440i, M440i
2017-2021 BMW 5 Series 540i
2018-2024 BMW X3 M40i
2018-2024 BMW X4 M40i
2019-2024 BMW Z4 M40i
2019-2024 Toyota GR Supra 3.0

Why Choose Supertech?

  • Engineered in Italy for global racing teams in endurance and drag series
  • CNC-machined in-house from certified 4340 billets for micron-level tolerances
  • Backed by lifetime warranty on manufacturing defects

Frequently Asked Questions

  • Q: Will these rods fit 2019+ Toyota GR Supra?
    A: Yes, direct fit for A90 Supra 3.0L B58 engine with identical 148.3mm length and bore sizes
  • Q: What finish and material treatments are used?
    A: Forged 4340 steel with shot-peening, nitride coating on big ends, and computer-balanced for zero defects
  • Q: What is the warranty and installation support?
    A: Lifetime against breakage from defects, includes installation instructions and ARP torque specs

Shipping & Handling

  • Method: UPS Ground or FedEx Ground
  • Availability: In stock - ships same or next business day
  • Packaging: Foam-lined cardboard box, 14 x 9 x 5 inches
  • Weight: 9 lbs

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