V-band radiation heat shield

An aftertreatment system comprising:

• a first housing having a first upstream end and a first downstream end and defining a first interior volume;
• a second housing having a second upstream end and a second downstream end and defining a second interior volume, the second upstream end coupled to the first downstream end of the first housing to fluidly couple the first interior volume to the second interior volume;
• a first aftertreatment component positioned within at least one of the first interior volume of the first housing or the second interior volume of the second housing;
• and
• a radiation shield comprising an attachment portion and a thermal barrier portion, the attachment portion coupled to an exterior of the first housing, the thermal barrier portion extending circumferentially around a portion of the second housing, the thermal barrier portion having a flared opening geometry structured to divert radiative thermal energy in a second direction different than a source direction of the radiative thermal energy.