Japanese Domestic Industry (JDM) autos are motor vehicles built and marketed in Japan with the Japanese market place. They are not exported beyond the region. Nonetheless, over time, the JDM label has expanded to include automobiles which were marketed outside of Japan but under various badges or for various quantities https://elevemotors.com/product/jdm-nissan-skyline-rb26-motor-for-sale-used-rb26-engine/