A work vehicle having an engine that generates exhaust gases flowing through an exhaust flow path to an exhaust vent includes a nitrogen-oxide (NOx) reduction device, a particulate filter, a temperature sensor sensing a temperature associated with the exhaust gases, and a plurality of flow control devices in the exhaust flow path between the engine and the exhaust vent. The plurality of flow control devices are operable to define a first flow path when the sensed temperature is less than a predetermined temperature threshold and a second flow path otherwise. The NOx reduction device is upstream of the particulate filter relative to the exhaust flow path in the first flow path and the particulate filter is upstream of the NOx reduction device relative to the exhaust flow path in the second flow path.