In a solution to the problems of both of these throttle systems, a butterfly valve throttle has become one of the most commonly used mechanisms in the modern day engine. The mechanism is much smaller, requiring only a small housing clamped around the throttle itself to hold the mechanisms. This configuration also proves to be a lighter solution. In addition, as the mechanism is already in line with the air passage, there are little problems in closing the mechanism even while at wide-open throttle. However, this mechanism is not without its problems, as the mechanism is located inside the throttle body itself, leading to a problem of having an obstruction in the path of the air flow, even at wide open throttle.