Apparatus for mixing exhaust gas and an additive

A motor vehicle having an apparatus for mixing an exhaust gas stream with additive, comprising:

• an engine for producing the exhaust gas stream;
• a mixing pipe for mixing the exhaust gas stream with the additive;
• and
• a first deflection pipe for deflecting the exhaust gas stream;
• wherein the exhaust gas stream can be fed on an end side to the mixing pipe via the first deflection pipe,
• the first deflection pipe has a fastening region for attaching an additive injector to the first deflection pipe,
• the first deflection pipe has a swirl generating wall region which is arranged on the end side with respect to the mixing pipe and is configured to impart a swirl to the exhaust gas stream;
• the swirl generating wall region is configured as a helical ramp, and
• the fastening region and/or the additive injector is/are arranged centrally with respect to a helix center axis, about which the swirl generating wall region extends helically.