Hey m8. You can go with 15s, 16s or even 17s.
You must watch that you get the right lug patern - Galant's have 4x114,3mm and than the right tire choice.
I asume you have 185/70/14 tires on 14s now.
You can get:
15s on 195/60/15
16s on 205/50/16 or 205/55/16
17s on 225/45/17 or 225/40/17
But on 2.0L SOHC 17s are not the best choice. Go with 15s or 16s
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