if i were going to buy fuel injectors i would get the custom ones from.. suprasport? or driftmotion? cant recall which one it is atm and i can't be bothered to take two seconds and check my bookmarks.
they use the same pigtails as the stock 440 ones.. there actually 440 cc injectors fabricated to 550.. comes with a warranty and everything. someone was selling a set of new ones on supramania for like 350.. good deal. there like 400 on the site.
yes low impedance