I'm upgrading to Cobb Stage 2.5. I tried searching but couldn't find an answer to my question. Can I use RC 550 injectors instead of the STi pinks, or will the different injectors, even though they are pretty much rated the same(550cc vs. 565cc), cause issues with the 2.5 set up?

I would just go with cobb's suggestion, so you dont run into any problems...

well, what the CC rating, and what they flow are TWO different things. The sti pinks are rated 525cc from Subaru, but people call them 565 because they've shown to flow that much. So the question is, what to the rc 550's actually flow?? If you can find out and it's on point with the pinks, then there shouldn't be a difference. If you can't stick with the pinks.