Wow. That's a big surprise to me! I've done some full scale dyno testing, and I know the dyno doesn't lie assuming all other factors are the same (ambient temp, humidity, barometric pressure, etc). So, I'm not arguing with the facts...
However, I've run the RB 2020 pipe on three different engines now (RB C6BB, Thunder Tiger Pro-21B-R, Sportwerks .26v2). This pipe is supposed to be very similar to the 2045, and while I've never dyno tested it, I've absolutely loved the way it's ran on all three engines. Never noticed any difficulty in tuning. I've also never seen a Sportwerks .26v2 run like mine with a JP3 on it, and there's several people running that combination at my track.
That Vspec is sick! Although it lacks a bit of bottom end torque compared to the 928, still looks like a monster! Looks very smooth as well... I wonder what a fully modded RB C6BB would look like in comparison. Maybe I should send mine in...
-Howard