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The EPA has proposed revising the Federal Test Procedure (FTP) used to evaluate compliance with emission standards. The revisions involve the addition of two new driving cycles, one of which (US06) includes high speeds and high acceleration rates. EPA has also proposed the operation of the air-conditioner on the “hot stabilized” cycle and the second (SC01) of the two new cycles. In order to meet emission standards on the new procedure, revisions to the emission control technology currently employed in cars and light trucks is required. In this study, we evaluated the range of potential changes to “engine out” emissions required, as well as requirements for catalyst improvements to withstand the higher exhaust temperatures and space velocity. Analysis of available test data suggested that power enrichment must be very nearly or completely eliminated to meet standards on the US06 test cycle.