Someone from usrt told you to use a 07 nozzle on a K03S??
That doesnt sound right...
You shouldn't be running more than one 03 or two (one 02 post Intercooler and one 01 post TB) maybe 04 tops.
I'm saying this because 1. They know their stuff and 2. I ran a D07 or 06 (cant remember) but it was bogging down the engine more than helping.