Well Maybe you can say:SAI or KPI not Important too Much Compare With Castor Angle, But Generally, The KPI value Changed will results in Camber Value Change Also,After Learn What is KPI deeply We can Understand INC angle Easily, And With the Relationship between KPI,INC and Camber, we can find the Failure Position Quickly,So During Wheel Alignment Angles Training, KPI and INC belongs to compulsory course,Today's Video introduce Concept of KPI, hoping it can help you on What is Alignment KPI