Just leave your car stock for now. Enjoy it. If you start modding it right away, you'll do so much that you'll get bored with your car. I modded my 6th gen and I almost want to go back to stock and I have no clue why. My car looks nice as hell with the mods I have but I will not do any engine mods. I like the engine the way it is and feel that I can spend my money on better things. I'm not dissing anyone who enjoys this, its just not my type of thing. I 'm more of a looks kinda guy then a under the hood. I dont race around or go to a track and race therefore its not important to me. K&N Filter and i'm happy :-) Anyways, just keep your 2003 new and take care of it. Worry about the mods a few years from now. You said it was a family car so use it with the family and enjoy it!