Many of the historical "Japanese " JDM companies outsource some or all of their forging outside of Japan. The companies that don't as far as I know are Miura , OnOff and Mizuno . I was told by a Fourteen representative ( Owned by Globeride that also owns OnOff ) that some of their line is produced outside of Japan..
Endo is a premium Forging house that produces Epon , OnOff , Yamaha , Srixon and others .