Injectors which required the new style connectors as well. I purchased mine as new and not redrilled injectors so this is something that you need to be on the look out for. My car was dyno tuned by Z1 Motorsports and they got 458 RWHP out of this setup. Also I know that some people opt for the 740 / 750 injectors as the ECU controls the duty cycle. Going larger now for basically the same money would help you out if doing additional upgrades down the road. I considered it but stuck with the 550's as my set up is for occassional track use but mostly weekend cruising.
