So i bought AUS Injection (B56010-550-4) 550cc injectors last night used for b/d/h series hondas, but they were for $74 on amazon for a set of 4. I knew this sounded crazy and i should have bought all the injectors they had because i checked back this morning and they were back up to their normal list price (around $260) so i guess my question is, can i use these honda high impedance injectors in my 420a? If not i could always sell them for a healthy profit. Also if i can use these, it will be for a later build and date.
Also im sure many of you know your stuff about p&h and static injectors, is there a huge difference between managing/tuning? Ill obviously have a safc later and all supporting mods, but anything special in regaurds in using after market fpr, and fuel mods or will the oem ecu and tuning the piggy back sort out the different types of electrical current delivery?

420a powered cars use High-Z injectors, as I recall, so impedance shouldn't be an issue.

It's more a question of: "Will they fit my fuel rail and head?"

I *believe* your stock injectors are rated at 19lb/200cc. A 125% increase is pretty significant, I don't know if you can dial that much out with an AFC. (Bear in mind that I have no experience with that particular tool.)

Right on ya ill give them a try, i should be able to use some good 420a rubber seals and see if they fit. Although when i start tuning and modding fuel delivery ive always either helped with instruction from someone else or had someone help me, very complex if you actually think about the electronic aspect of fuel delivery, mechanical add ons are cake work