Precision-forged M54B30 connecting rods for BMW E60 530i & compatible models. High-strength 4340 chromoly steel construction with CNC-machined bearing surfaces ensures ultimate durability under extreme loads. Weight-balanced design reduces vibration for smoother high-RPM performance in E83 X3 330i and E46 applications. Shot-peened surface treatment enhances fatigue resistance for track or turbo builds. Direct bolt-on upgrade maintains OEM bearing clearances while doubling tensile strength over stock rods. Includes premium ARP2000 rod bolts for reliable clamping force. Ideal for M54 engine rebuilds, forced induction conversions, and high-compression NA builds seeking bulletproof bottom end.