BoostLine BM5834-866+ Connecting Rod Set for BMW/Toyota B58B30

Vehicle Fitment

• BMW B58B30 applications (340i, 440i, M340i, M340i xDrive, Z4 M40i, RWD/AWD)
• Toyota GR Supra MK5 (A90/A91, B58B30 engine, RWD)

Fitment Notes

• For B58B30 (3.0L turbo inline-6) engines only; does not cover other B-series BMW engines (e.g., B48, B58TU variants) without confirming pin/journal match
• Sold as a complete set of 6 to match the engine's cylinder count

Features

• Forged from premium 4340 steel for high-boost durability
• Patented three-pocket design balances strength and weight
• 60% improvement in bending strength over H-beam designs
• 20% reduction in tensile stress versus H-beam rods
• Equipped with ARP 625+ Custom Aged rod bolts
• High-quality APMCO bronze pin bushing
• 26-point CMM inspection with included report
• Rated for up to 1,500 HP

Specifications

• Length: 5.834 in. (148.18 mm)
• Pin Diameter: 22.00 mm
• Journal Diameter: 50.00 mm
• Bolt Size: 3/8 in. (ARP 625+)
• Material: 4340 Forged Steel
• Quantity: Set of 6

Included Components

• 6x Connecting Rods
• 6x Sets of ARP 625+ Rod Bolts
• 1x CMM Inspection Report

Product Description

The BoostLine BM5834-866+ is a matched set of six forged connecting rods built for the BMW/Toyota B58B30 3.0L turbo inline-six, a platform shared across BMW's 340i, 440i, and M340i lineup as well as the Toyota GR Supra MK5. Machined from 4340 steel with BoostLine's patented three-pocket design, the set is engineered to handle the cylinder pressures of high-boost and nitrous builds while keeping rotating mass under control.

Each rod in the set is equipped with upgraded ARP 625+ Custom Aged bolts and individually verified through a 26-point CMM inspection, with documentation included for every kit. Rated up to 1,500 horsepower, this set suits B58B30 builders pushing well beyond stock power levels who need a stronger rotating assembly than the factory rods can support.