Responsible for the strict regulations - and probably the FIA ban on movable aerodynamic devices.
Responsible for rewriting rules of what is now our largest series.
Responsible for connecting countries in a matter of hours.
Care to tell me again that Americans ignore Aero?
The Japanese simply have rules that allow greater freedom in aerodynamic devices. This likely stems from their rather liberal Silhouette rules of the early '80s...which, some teams admit, they didn't know much then. As well, because their tradition is formed on road courses, downforce is more important, and drag less. (These cars would likely have much higher top speeds with cleaner bodywork. In fact, there was a separate Fuji/Suzuka variation of the GT-R and NSX last year to reduce drag.)
Our oval track tradition (which actually stems from the fact that states wouldn't allow us to run on open roads in the early days of racing like in Europe, thus we took to Horse Racing tracks - typically 1-mile ovals made of dirt...blame the state and local governments of the 1900s!) requires a different focus on aero - low drag. Indy and stock cars don't have wild wing and horn setups because that'd slow us down.
As for the SCCA, remember, it's club racing. Some classes can get quite prestigious, but at it's core, it's guys who don't have huge money or sponsorships, barely get national exposure, and don't have half the budget of some of these tuners who get tons of exposure throughout Japan, and the rest of the world, thanks to a series of internationally distributed video magazines, sponsorships on real national-league and international-league race cars, and the like. As well, yeah, the tech regs are tight. Thank guys like Jim Hall and others who pushed the limits further than the organizers would like. For that matter, Japanese aero rules are more liberal than EUROPE'S. The FIA wouldn't DREAM of allowing a GT300 or GT500 car run in any of their series - that's why the FIA GT GT-R looks like this...
and not THIS
Furthermore, the GT Association is supposedly to be adopting FIA rules...((which I somehow doubt)) in the near future, so get ready to see those aerokits drop off like flies...
and I'm calling the Nismo GT1 and Calsonic Impul GT-R enough to remain on-topic.