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Abbreviation for German Domestic Motors. Alike to JDM (Japanese Domestic Motors) and USDM (United States Domestic Motors). GDM implies a higher class of car manufacture and car parts. It is also a tuning style wherein Japanese cheap parts and modifications are avoided and higher quality parts and clean and subtle modifications are used. A GDM BMW can have BMW Style 32 wheels, not Koya Driftecs.
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