The Japanese domestic market designates cars, engines, and components manufactured strictly for Japanese consumers, adhering to their specific road regulations. Enthusiasts import JDM engines for their higher power outputs or unique specifications not found in export models. The term is heavily used in tuning culture to describe authentic Japanese aftermarket parts or right-hand-drive imports.
Heard on the job
He paid a premium for a genuine JDM front bumper because the export version has those ugly crash bar extensions.