That's interesting.
I have always been told that Fujitsubo only sold the Super X headers for the Gen 2 3SGE, so I just assumed that they wouldn't suit the Gen 3.
I actually run the Super X system on my Gen 2 motor, and it is beautifully made full stainless.
The headers have equal length pipes unlike the stock headers, and are 4 kg lighter too.
I note that my Super X header/exhaust system is 4-2-1, the same setup as the stock Gen 2 system.
I think the stock Gen 3 exhaust system is 4-1.
I note on your link the pics show a 4-2-1 setup.