This article is about the car manufacturer. For the character in GTA IV, see Karen.
Karin is an automotive company in the HD Universe. The company is most likely based off the real-life manufacturer Toyota or Lexus.
However, the Sultan RS and Korean Mob Sultan are modified like Subarus even though they are both based on a Lexus (luxury subsidiary owned by Toyota) combined with a Mitsubishi; and the Intruder is based on Infiniti. But it should be noted that Toyota owns a small part of Subaru and the companies have or at least will make certain vehicles together. It can also be implied that Karin is a Japanese luxury car manufacturer.
The name might be a parody of Kia as Kia and Karin are spelt similarly and are both girls' names; the logo also bears resemblance to their corporate logo (mainly the top left tip of the "K"). The name might also be a reference to Toyota's Carina series.