Who really cares what JDM is? The majority of JDM performance parts can be sourced domestically for a fraction of the cost. Why pay $1100 for a Trust/Greddy exhaust when you can get Joe Schmoes muffler shop to make you the exact same 3" mandrel bent exhaust and YOUR choice of a muffler and tip. Same goes for fancy HKS turbos when you can get a solid Garrett custom made here in the USA, or Blitz ICs when you can get Spearco here. I could go on forever, why spend $5K on a Tomei stroker kit when you can piece together one with Eagle rods, Mahle pistons, etc for the same or cheaper and not have to wait 5 weeks for your crate to make it across the pacific.
I'm all for JDM if its a JDM motor that is much better than the USDM equivalent. Buy parts for your car because you like them, not because you're trying to fit some JDM image. I guess if you like paying too much for a name brand then go ahead and get your JDM Bride seats instead of Corbeaus or Cobras. But seriously, JDM folding mirrors, who really gives a damn? JDM coin holder in the dash, again WTF? JDM windows, ooh thats hot ****.
/rant. Buy american.