In a rule published November 8, 2002, EPA promulgated new emission standards for recreational vehicles beginning in model year 2006. This included a newly regulated class of nonroad vehicles/engines commonly referred to as all-terrain vehicles. In that rulemaking, a temporary provision was included allowing manufacturers to test all- terrain vehicles over a steady-state, engine-based, duty cycle for exhaust emissions prior to the 2009 model year in lieu of the transient, chassis-based, Federal Test Procedure which was effective for 2006 and later model years. In this rulemaking we are taking direct final action to extend the availability of this temporary provision for in some cases up to an additional six model years. More specifically, manufacturers would have to certify exhaust emission engine families representing not less than 50 percent of their US-directed production on the Federal Test Procedure in model year 2014 and 100 percent in 2015. Manufacturers with only one all terrain vehicle exhaust emission engine family would not be required to use the Federal Test Procedure until the 2015 model year. For those manufacturers who have not yet done so, this will allow additional time to certify to the previously promulgated Federal Test Procedure-based emission standards using either contract facilities or by obtaining in-house capability.