Perforated mixing tube with swirl body

An exhaust aftertreatment system may include an exhaust pipe and a mixing tube. The exhaust pipe increases exhaust gas from an engine. The mixing tube is arranged in the exhaust pipe and may comprise a tubular portion and a plurality of vanes extending from one longitudinal end of the tubular portion. The tubular portion may include a plurality of openings that extend through an inner and an outer diametrical surface of the tubular portion. The tubular portion and the plurality of vanes to define a unitary, integral body.