05 Toyota Corolla XRS

Hello. I just bought a 05 Corolla XRS and was wondering if there were a few things I could do to it right away to give it a little boost. Would you guys reccomend just a regular K&N drop in filter or going all the way and putting a cold air intake on it? I am a amsoil fan as well so I will be putting synthetic in as well. I love the car and any help would be great. This is my first toyota but my girlfriends family has always had toyotas. Thank You.