The Carrillo BMW M5/M6 S63B44T0 Pro-H 3/8 CARR Bolt Connecting Rods (Set of 8) are a high-performance set of connecting rods designed for BMW M5 and M6 engines. These rods are made from high-strength 4340 chrome-moly steel and feature a 3/8 CARR bolt that is rated to over 1,000 horsepower. They also feature an improved design for increased piston pin offset and improved oiling. These rods are a must-have for any BMW enthusiast looking to maximize the power and performance of their engine.