Exhaust system sound generation assembly unit

A sound generation assembly unit kit, for building a sound generation assembly unit for an exhaust system of an internal combustion engine, the sound generation assembly unit kit, comprising:

• a sound generation module comprising a sound generation module housing to be arranged on an exhaust gas guide element of an exhaust system and a loudspeaker unit arranged in the sound generation module housing, the sound generation module housing comprising a partial rear volume, the sound generation module housing comprising a sound generation module connection formation having a sound generation module connection formation width;
• and
• a volume modules group comprising at least two different rear volume modules, each one of the at least two different rear volume modules comprising a rear volume module housing with a rear volume formed in the rear volume module housing, the rear volume module housing comprising a rear volume module connection formation defining a rear volume module connection formation opening, the rear volume module connection formation opening comprising an opening width, the opening width being greater than the sound generation module connection formation width, wherein the rear volume module housing of each one of the rear volume modules of the volume modules group provides an acoustic characteristic differing from the acoustic characteristic of the rear volume module housing of each other one of the rear volume modules of the volume modules group, wherein, for providing the differing acoustic characteristics, at least one rear volume module of the volume modules differs from at least one other rear volume module of the rear volume modules group in whether or how the rear volume module housing thereof is lined with sound insulating or sound reflecting material, wherein the rear volume module housing of each one of the rear volume modules of the volume modules group is connectable to the sound generation module housing of the sound generation module via the sound generation module connection formation and the rear volume module connection formation for an acoustic coupling of the rear volume to the at least one loudspeaker unit, wherein, with the rear volume module housing of one of the rear volume modules acoustically coupled to the sound generation module housing, the partial rear volume is in operative connection with the rear volume of the rear volume module housing of this one of rear volume modules.

A sound generation assembly unit kit, for building a sound generation assembly unit for an exhaust system of an internal combustion engine, the sound generation assembly unit kit comprising:

• a sound generation module comprising a sound generation module housing, to be arranged on the exhaust gas guide element of the exhaust system, and at least one loudspeaker unit arranged in the sound generation module housing, the sound generation module comprising a sound generation module connection formation;
• and
• a first rear volume module comprising a first rear volume module housing with a first rear volume formed in the first rear volume module housing, the first rear volume housing comprising a first rear module housing connection formation defining a first rear module housing connection formation opening, wherein the first rear volume module housing is configured to be connected to the sound generation module housing via the sound generation module connection formation and the first rear module housing connection formation for an acoustic coupling of the first rear volume to the at least one loudspeaker unit;
• a second rear volume module comprising a second rear volume module housing with a second rear volume formed in the second rear volume module housing, the second rear volume housing comprising a second rear module housing connection formation defining a second rear module housing connection formation opening, wherein the second rear volume module housing is configured to be connected to the sound generation module housing via the sound generation module connection formation and the second rear module housing connection formation for an acoustic coupling of the second rear volume to the at least one loudspeaker unit, wherein the first rear volume module housing has an acoustic characteristic that is different from an acoustic characteristic of the second rear volume module housing, wherein an interior of the first rear volume module housing is provided with an amount of sound insulating or sound reflecting material that is different from an amount of sound insulating or sound reflecting material provided in an interior of the second rear volume module housing.