Kinugawa STS (Superior Turbine Strike) Advanced technology improves the response speed (time needed to build boost) by 10-15% and is more durable due to the improved shaft dynamics control. The increased power comes from the enhanced design. It utilizes an inner and outer race with rollers or balls between the two races. The inner race is pressed onto the turbo shaft, and the outer race is pressed into the CHRA. The rollers or balls replace the oil’s “job” of controlling the turbo shaft’s orientation but still need to be lubricated.