Those aren't "US spec" and "JDM spec.." The first one is the one that you would use for N/A cars. THe second is for Forced Induction.
...actually, the first pic shown is the new v.III of this exhaust, ready for the U.S. -- the second pic was the v.I was too loud for street use in Japan or USA, so they attempted v.II with a slightly different canister, which was still too loud.
Above are the pics of the v.II prototype on my car. Neither v.I or v.II are available to the public. This exhaust is very loud, but fitment was excellent and Performance has exceeded my previous TSRM and Espelir JGT500. I'm not sure how the v.III will perform because TRIAL expected a slight loss in power compared to the v.I or v.II prototypes, but if there is one I doubt it would be noticeable.
Pics of the Turbo application have yet to be released, and I'd like to see if they will use the v.III design, but with larger piping and a bigger muffler inlet/outlet.