Matty from WA did. Shame he doesn't post much anymore.
5-700 earlier boost threshold, back on pipe in 1/3rd the time (Motec logs) compared to the -5's. Smashed it everywhere. This was on a 3.0. Literally take -5's off and bolt 8374 into place with the necessary changes made to make it work.
Even driving Nicks car "untuned", the 8374 with the "laggy 1.05 rear" belted in every - single - way. Boost threshold - yep.
Transient - yep.
low end grunt - yep.
top end power - yep.
Should have reaults in the next few days.
As been said a million times, the real world driving is what impresses the most and what the dyno doesn't show.