Would be awesome to get that onto some decent boost management so that in the higher gears you could have the spike back then once you have the grip for it if its still capable of making the big boost figures lower down now on the new head etc, or even getting close to them for that matter, rather than (im assuming) relying on an old level 8 which has no concept of what gear you are in.
Its specs like this (huge power in rwd chassis with limited grip) that really show up the shortfalls in what you can achieve in the real world on such basic management.

Does it feel a lot slower now in normal driving in the higher gears with the drop in midrange torque from not having the boost spike anymore to stop it spinning in the lower gears? Or does it tend to live most of its life above 6K rpm where the gains are anyway?

Did Karl comment on why it makes so much less torque now at 6Krpm despite the extra boost, as that seems counter intuitive to what one would expect to happen at those sort of revs on a "bigger" head.