Hi, I'm new to this place but so far I have found a lot of the information help full. Anyways, Im in the middle of building #1943 and here is what I have done so far, bored .020 over eliminated the balance shafts, AEM fuel rail 2g maf and an injen intake w/ K&N. I would like to upgrade to 550 injectors but i had a question about impedance. I know what the difference between high and low impedance injectors but which ones do I need to run? any help would be nice... thanks