If you plan on going for big power down the road (ported heads, blower, etc etc) you’re going to need the fuel, and a way to keep IAT temps down. It’s kind of like a rabbit hole, because once you start, you realize you need other things to support this mod and that mod.
before you start throwing money at mods, I would nail down what you really want out of the car as far as power goes. That will help you eliminate buying some things and having to upgrade them down the road.
with the stage 3 came already in there, and adding other mods to go with it, you may want to look into heads so that things are flowing well and you’re getting the most efficient setup for the mods.
others with more time on the LSA are sure to chime in as this forum is a wealth of knowledge. Paging rubber duck