Stands for Japanese Domestic Market. It is for car parts. Main compaines are Honda, and Nissan. The reason for JDM is because many import cars such as Civics and Integras have been "detuned" to meet regulations in the United States. Therefore swaping a Japanese engine into an "American" Honda Civic is considered intergration to its truest form.
Many difference that many people don't know is it is seperate from the ricer street racing scene. Many races are on profession tracks. Which many enthusist race in Time Attack. JDM compared to ricers are much cleaner in their styling.
Ricer V. JDM
4 inches no name muffler
17inches Chrome Rims
Clear Altezza Taillights
Clear Cornered Headlights
Cut Springs to lower ride
OEM exhausts ( Civics will upgrade to CTR: civic type R exhaust)
16inch JDM rims (Brands such as Volk, Rays, Spoon and etc.)
OEM headlight and taillights
Full Coilover systems
Main Difference is All JDM parts are named brand to ensure performance. Most JDM parts are more expensive because it needs to be imported to be the real deal