Precision injectors suck IMO. I've seen people complain about those not flowing as much as they are ment to, so it may be hit or miss thing ... Before somebody starts arguing I'll say that this is just IMO (that they suck)

when I ordered my RCs, those came flow tested and were withing 1% of the nominal. (actually about 0.5% withing each other). I also paid about 300 shipped, but it was well worth it since I haven't had a single problem with them.