If you live in a "hilly" area you will feel it a lot more than guys in flatlands - you will barely be able to get into OD with an auto tranny. I hated 31's with 3.55s and had to regear within a week. It depends on how much power loss you can tolerate. I would plan on regearing.
i have 3.07 with 30s on right now it is not that bad i raced late 90s dodge ram the other night and out ran him. of curse i have a manual and 1st gear is 3.83 instead of the autos 2.80 but starting from second (2.33) is not bad when the clutch is feathered.
anyways just plan that down the road you might get tired of riced civics passing you and want to regear.