If you are working on a budget and are staying with side feed, get STI side feed 550s. They cost half what the DW or Nismo versions cost and work fine. I had a set on my car.
The MSD injectors; bosch style top feeds, are not the best as that design is harder to tune than the injector dynamics, thinner type of top feeds. The I'd injectors are the ultimate as they are so tunable that you don't have to worry about buying injectors that have a little headroom for growth. A powr FC for example won't like 800cc MSD injectors but can tune IDs of 1K+.
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