Product Description
BMW N55/S55 Connecting Rod Set - ItalianRP IRPR504
The ItalianRP connecting rods are a solid performance upgrade for anyone building or reinforcing a BMW N55 and S55 engine. Designed for the 3.0L inline-six found in models like the 135i, 335i, 535i, M235i, M2, M3, M4 and even Alpina B3/B4, these rods are made from high-strength 34CrNiMo6 steel to handle increased power and high-stress conditions. Each rod is precisely machined and balanced, with a center-to-center length of 144.35 mm and a 22 mm wrist pin to match factory specs. ItalianRP offers these in Silver, Gold, or Platinum lines, with different bolt options (VIMI2500, L19, or Custom Age) to suit various builds—from spirited street cars to serious track setups. Whether you're going big on boost or just want added peace of mind, these rods are built to take the punishment. This connecting rod is paired with this piston set if you have the N55 engine or this paired with this piston set if you have the S55 engine.
| Features | Specifications |
|---|---|
| Rod Code | IRPR504 |
| Piston Code | IRPP505DA or IRPP506DA |
| Engine Code | N55/S55 |
| Number of Cylinders | 6 |
| Big End Diameter | 53.600mm |
| Big End Width | 20.900mm |
| Pin Diameter | 22.000mm |
| Between Centers | 144.350mm |
| Compatible Vehicles | 135i, M2, M235i, M235i xDrive, 335i, 335i xDrive, 435i, 435i xDrive, 535i, 535i xDrive, 640i, 640i xDrive, 740i, 740iL, 740iL xDrive, X1 xDrive35i, X3 xDrive35i, X3 sDrive35i, X4 xDrive35i, X4 M40i, X5 xDrive35i, X5 sDrive35i, X6 xDrive35i, and X6 sDrive35i, M3, M4 |
| Manufacturing Origin | Italy |
ItalianRP is a performance engine component manufacturer based in Italy, specializing in high-quality forged pistons and connecting rods for European and Japanese engines. Known for their motorsport heritage and precision craftsmanship, ItalianRP parts are designed and built in-house using top-grade materials like 2618 aluminum and 4340 steel. Every component undergoes rigorous quality control and is CNC-machined to exacting tolerances, ensuring reliable performance in everything from street builds to full race applications. With a growing presence in North America through ItalianRP USA, the brand brings together Italian engineering excellence and a passion for pushing automotive limits.
