A process and device for using a PSA oxygen concentrator to provide a high oxygen air intake mass into the combustion chambers of an ICE in order to improve gasoline mileage, reduce undesirable exhaust components and allow a TWC to come into full operation more quickly. A method of improving the quality of an air mass taken into the PSA device is taught. Both a retrofit methodology using commercially available PSA concentrators and a method of using component parts of same to create a differing architectural arrangement suited to fit the particular needs or spaces are presented.