My first run with new turbo's was 316kw at Willall in Jan this year, then 311kw at Grahem West in March. Only change is the straight through exhaust.
I just had a look at my peak boost on my boost controller from the dyno runs and it was only 1.22 bar which is less than 18psi
I was trying to turn it up after each run but it wouldn't go any higher, maybe i was doing it wrong?