For Any time period with these types of outsized importance in auto culture, "JDM" can be an acronym for a fairly tedious phrase: Japanese Domestic Industry. It refers to goods built and supposed for sale and use within Japan (i.e., not for export). This involves all the things from cars https://elevemotors.com/product/ford-mustang-gt-v8-5-0l-coyote-gen2-engine/