The commonly available injectors for the 603 cannot create a "power increase".

It's simply a valve and a nozzle. When the valve gets to a specific pressure, it opens and a fine mist of fuel is sprayed into the prechamber.

If you want a power increase, you need to adjust the IP. This is not for the faint of heart and you'll melt some pistons if you are not cognizant of the exhaust temperature and maintain it within reason via modulation of your right foot.