fuel injector cleaning/swap??

[j.fro]

I haven't had the two types of injectors in front of me, but from my research it looks like the early (2 hole?) part number is 996-606-120-01 while the later is 996-606-122-00 (4-hole). This information came from Pelican. It also looks like the injectors for all Boxsters and 3.4 Carreras are the same. Not sure for 3.6 & 3.8 Carreras.

I'm very interested in learning how tuning through fuel pressure and injectors can augment intake airflow and exhaust mods.