The Environmental Protection Agency receives information about devices for which emission reduction or fuel economy improvement claims are made. In most cases, these devices are being recommended or promoted for retrofit to existing vehicles although some represent advanced systems for meeting future standards. The EPA is interested in evaluating the validity of the claims and invites proponents of such devices to provide to the EPA complete technical data on the device's principle of operation, together with test data on the device made by independent laboratories. The conclusions drawn from the EPA confirmatory tests are necessarily of limited applicability. Data supplied to the EPA by Ball-Matic, Inc. indicated that their emission control device (called the Ball-Matic) was capable of reducing exhaust emissions. An EPA confirmatory test program was arranged to further investigate the effects of the Ball-Matic on exhaust emissions.