Yeah we tend to focus on the 2% of things we disagree on, rather than the 98% we do agree with each other on.The downpipe you posted isn't the Signature Series downpipe. It's actually made by the company in Australia that makes the standard bellmouth exhaust.
Here's the standard bellmouth exhaust. I'd like to see some sort of tech, or even a reasonable explanation, as to why it's actually better to put the cat in the midpipe. I do know that it functions very poorly in that location, as it's very difficult to get it up to light-off temp. Having it 6-8 inches away from the turbo, where exhaust flow whould be fairly smooth, shouldn't make a huge difference, especially when you have a bellmouth.
I can't go into details about Nate's downpipe magic, but I can explain it in person sometime.