Dude search on the performance forum, https://www.thegalantcenter.org/forumdisplay.php?f=21,
the first upgrade many do is the 5 spd swap from a 00-05 eclipse, search for that on the search feature, then you can swap a Evo VIII head or Kia Optima head to make it DOHC, or Turbo, all the info is in the forum even How To's and parts lists, just look for those key words on the search feature in the 8G section since 99-03 galants are 8g's.
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