Abstract: A barbell system for enhancing weight lifting exercises is described. The barbell system includes an elongated barbell comprising a first end and a second end. Weights are provided for placing symmetrically on the first end and the second end. A locking device is provided for securing the weights to the bar wherein the locking device has a split collar capable of receiving the elongated bar therein; and a locking device capable of drawing the split collar into engaging relationship with the elongate barbell.

Abstract: An automotive engine and exhaust aftertreatment system includes an engine, a catalytic exhaust aftertreatment device for receiving exhaust gas from the engine, and an air source for supplying air to the exhaust stream entering the catalyst. An exhaust gas oxygen sensor determines the amount of oxygen contained in the exhaust entering the catalyst, and an engine control computer connected with the air source and with the oxygen sensor monitors the amount of oxygen contained in the exhaust and controls the amount of air supplied to the exhaust stream by the air source such that the available oxygen is slightly in excess of the stoichiometric requirement. In this manner, the light-off time of the catalyst is minimized.