Japanese Domestic Market (JDM) cars are autos built and marketed in Japan for your Japanese industry. They're not exported outside of the country. However, with time, the JDM label has expanded to incorporate cars that were bought beyond Japan but under different badges or for different amounts of time. This https://elevemotors.com/product/jdm-nissan-skyline-rb26-motor-for-sale-used-rb26-engine/