You didnt understand what i posted, did you?

APC is an U.S company that market "cool" and flashy products like strobe lights, spoilers, etc. at your local auto parts store and online.
While JDM is NOT a company at all!

"The Japan domestic market (JDM) is a term used to describe Japan's market for purchasing things, chiefly automobiles. A similar term, United States domestic market (USDM) is used to differentiate US-only products. Some people interpret "M" as model."
http://en.wikipedia.org/wiki/Japan_Domestic_Market

JDM is used to lure people saying that "its imported, which means it was made for your honda, nissan, etc, so that means its rare in the US, which means YOU MUST HAVE IT"