splinter, here's the info I've gotten after extensive research:
The '04 cars have the same injectors as a Stage 1 kit would provide, regardless whether your '04 is a GT or Lite. For example, if you have a totally stock '04 Turbo, either version, and an injector goes bad, the part numbers are the same for either turbo motor. And these are, in fact, the same 577cc injectors that an '03 could only get with a Stage 1 upgrade.
Stage 1 kits for the '04 cost the same as S1 kits for the '03 models, but include ONLY the PCM (not sure how a single part is called a "kit", but what the heck). Whether this is fair or not really isn't the point - no matter how you slice it you net out 235HP when you're done, no matter if your S1 is applied to an '03 GT, '04 GT or '04 Lite. In that regard, I suppose it is fair - it's just a larger increase for the owners of '04 Lites.
This info comes from those who have actually done this (FRM3), and those who should know for other reasons (3barboost). I currently have my S1 kit (yes, PCM only) on order and will be installing it myself thanks to some wonderful help and insight from a member of this forum. (Tommy, you rock dude!)
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