For A phrase with these types of outsized relevance in motor vehicle culture, "JDM" is an acronym for a fairly unexciting phrase: Japanese Domestic Industry. It refers to items built and intended for sale and use inside Japan (i.e., not for export). This involves every thing from cars just like https://elevemotors.com/product/jdm-nissan-sr20-turbo-engine-for-sale/