An exhaust treatment system comprises an excitation chamber that generates a plasma field to excite a stream of exhaust gas and a mixing chamber that allows a portion of the exhaust gas stream to be oxidized. The excitation chamber comprises an inner housing, an outer housing, and an exhaust inlet that directs a stream of exhaust gas to enter into the outer housing of the excitation chamber. The enclosure of the inner housing includes orifices that allow at least a portion of the exhaust gas to enter into the inner housing from the outer housing. The inner housing includes electrodes for generating the plasma field. The inner wall of the inner housing includes a surface topology that cooperates with the orifices of the enclosure to entrain the exhaust gas to travel in a coherent-structured turbulence flow form in the inner housing.