You should be running a cold air in the summer, it draws more in through induction under the bumper, and draws the coolest air (cold air intake) You should be running a Short ram in the winter, with a water/particle filter so you don't waterlog the block.
If you don't understand on what the difference it is, then you need to start using your friend,
www.GOOGLE.COM seriously.
As for brand, everyones right, fujita and Injen are pretty much the best out there and they have PROVEN HP gains.
If you got the money you can go with an HKS, or K&N, or Edelbrock, Id only recomend the HKS with high high Horses, and the Edelbrock only on true muscle/street or track.
Hope that helps and makes it easier for you.
Some K&N kits come with both the down pipe (Cold Air) and the shorter pipe (Short ram)
But you'll have to search high and low for them, try Kragens auto parts, or go direct through the vendor.
Most of these kits will not even advertise or tell you about the accessories, like the water shields etc etc that are available. Most people dont use them, but if your going to leave on the intake 24/7 you should look into it.
If you don't it could cost you your ride in the long run.
If you can't find the exact one for your year of galant, just search for what other vehicles have the SAME EXACT enging set up. I believe the new gen eclipses are running the same engine as our 9th gens. But don't quote me on that.
Take it from my expirence and knowledge as well, if the kit says bolt on.... You will ALWAYS be having to cut or bend something to get it to fit properly.