I'd also pick up an Ultragauge or one of the other scanner tools. They are all cheap and add a bunch of interesting information streams, but they also let you read CELs and clear them yourself. If you're going to be modding the car, you're going to end up throwing CELs with some frequency, with a gauge that's a simple matter of checking the number online to see if it's something interesting or just a nuisance, and a couple button presses to clear the code. Without one, it's a matter of paying someone to do it (probably more than the cost of a gauge tool for just one clear) or putting some electrical tape over the light and driving around without the potentially informative warning.
Without a tune of some kind, you won't really get anything from a new intake but a different noise; the stock tune is deliberately set up to dumb down any changes you make so the car continues to perform at its worst. I mean that literally; in order to prevent you from freaking out when you have less power on a warm day than on a cold one, they set the computer up to run power as if you were breathing warm summer day air all the time.
Admittedly the ZZP noise is nice, if that's all you wanted, put the sleeve in and enjoy, no tune needed...