CNC-machined 50mm ECS drive shaft created from world-renowned HUDY Spring Steel™. This race-quality drive shaft is an extra component for #305331 Equalized Corner Speed (ECS) Drive Shaft 50mm - HUDY Spring metal™ (1), solely manufactured by HUDY. Drive shaft diff end was strategically lightened to lessen rotating mass without compromising power. The drive shaft is updated with a stronger 2mm pin for increased durability and reliability.