stock look better than anything on the market. Clear or alteza style tail lights Scream im a little 16 year old and dont know any better so you should really consider leaving the stock ones on it, perhaps buy some smoke front head lights especially if yours are getting yellow and ugly.
keep your stock tail lights on unless you want to go sequential...and get them from www.ponyperformance.com and you'll get a good deal.
CAI - Cold Air Intake. There are many controversies on which brand is the best. There are plenty of people (such as I) who say buy one off ebay for $55. Then there are more who say spend $150-$200 on a name brand one that does the same thing, but has a pretty logo on it. lol. I've held my CAI up against a MAC one from my friends car and it's got the same exact bends in it, and I paid over $100 less than his.
But if you want alzetta tail lights don't look for any agreement on this forum, try mustangworld or v6power, lol.