I bought my first camaro a little over a mouth ago, it is a 2000 z28. All that I have done to it is put magnaflow exhaust on, and I had to pull the heads so while I had them out I had a valve job done on the heads plus I put all new springs in and I had them do a triple angle valve job. I am look at trying to find small relatively cheap upgrades (I am a college student). I had been looking at a K&N CAI but I have been seeing that a lot of you do not use them instead you go with the lids+airbox systems (I have been looking around the forums for a couple of hours

) is there much of a difference between the two or is it just personal preferences? I was also seeing that some people had trouble with the lid hitting the hood, I am looking at replacing the stock hood with something like this (see attachment below) though I am not set about that hood. For the lid+airbox I was looking at something like this
http://www.lmperformance.com/3224/1.html? Any input would be much appreciated, or if you have any other good upgrades for under 500.
Matt