KIPS - Kawasaki Integrated Power-valve System was revolutionary. Exhaust devices for 2-stroke engines can be divided into two types: those that offer exhaust port control, and those that offer exhaust chamber control. The former type regulates the size of the exhaust port opening, making it smaller at low rpm and larger at high rpm; the latter added a resonator near the entrance of a high-rpm exhaust chamber, enabling chamber volume to be increased so that it could function as a low-rpm exhaust