<p>The vaporization device (12) has a carrier structure with circular cross-section that is arranged transverse to an axial direction (20) of the device. The carrier structure has two opposite long side walls and two opposite short side walls that are interconnected. Several guide vanes are provided at axial end of one long side wall and away from other long side wall in axial direction. Independent claims are included for the following: (1) an exhaust system; and (2) a selective catalytic reaction (SCR) catalytic converter.</p>
