Why would it be harder up here in QLD. I had all those papers for my project and they were sent back saying ask the engineer. I got the go ahead, and then a fella i knew walked in and saw it and said when im ready give him a ring and he will sign it off no worries. RB20t btw.
As for the cat, their are quite a few cars where the cat is a fair distance form the engine, i think soarers or supras are like 1500mm from the engine. But this is a little bit far back for light off, but thats only if they want to get technical. As long as it passes thats all that matters.
cheers Anthony