There is RND in twins
There is no difference between GTX 3582R and a GT3582 compared to say a GTX 2860 to a -5.
Same rear turbine, only difference is the front fan in both setups.
I'm 100% certain a -7 would come on earlier than a GTX 60mm but you know yourself it wouldn't get close to 400 kW, let alone 450.
So the smallest aftermarket factory position turbos against a 450 kW single. Matched everywhere, gates are making a nusiense at just over 4000 but go onto make 450 plus on a stock engine.
I don't give a fook, you know what's on my car but I can't see the inaccuracies in this when I couldn't tell you what low mount twins to put on to do 450 plus and be "on" by very early 4K would be on a very basic 2.6.