I know there is probably plenty of threads about this, but asking it myself is more fun. First of this is my plan, I'm building a 12a turbo using an fc intake and throttle body, custom exhaust and a pulsar 5455g turbo with split housing and duel wastegates. I want to run at 7-11 psi max. My question is what is the best injector to do this. I think for this power the t2 injectors might work, but those might be hard to find. What CC, and any recommendations on specific injectors.

Are you running a 12at centre plate or injectors in the manifold adapter? If it's only 2 injectors you probably want ID1300s minimum on pump fuel, 1750s for more power, if it's 4 you could probably run 1050 primaries and 1300 secondaries with room to grow a bit on pump fuel. If on ethanol probably 1300 primary 1750 secondaries.

That turbo should be very impressive on the 12A, although the pulsar split housing may be a touch tight for top end.

I'm using s5 I take on my 12a turbo, I'm using 4 750cc RC high impedance injectors. At 8 psi primary injectors go to 88% and secondary sees from 20 to 25% duty cycle.

I am 99% certain that the 12A Turbo intermediate housing is the same as the GSL-SE unit, if you want to have an OE-like ability to run primary injectors with parts you can easily find stateside.

FC primary rails fit GSL-SE and vice versa. I went for a long time with a GSL-SE fuel rail on FC engines because I prefer running only two injectors than mucking about with staging. This for natural aspiration.

Sorry I completely forgot about this thread, I'm planning on running the NA 12 iron (unless the 13b is a better option, wouldnt that change the port allignment needing front and rear irons aswell) and a JDL manufacturing adapter plate to either an fc or fd intake, idk which is better, ive never hear of only 2 injections, is the fuel dispersion/ attomization good enough, of course you would need double the injector for the same result.