I would reccomend the J's Racing or Toda header with an Amuse titanium exhaust. THe J's and the Toda seem to make about the same power. The Amuse has an ok gain but you have the choice of single or dual and the titanium will save a ton of weight. Get a good test pipe too. As far as an intake goes, there's not much power to be had there (MAYBE 2 or 3 hp with a cold air intake, but I bought an AEM V2 mostly for sound and what little hp increase there may be.). I would also look into some 4.77 gears. They make a pretty good difference in acceleration (but like others have said, you sacrifice a little top speed). Then get an AEM EMS and have your N/A combo dyno tuned. You will see around 20 to 25 hp to the wheels.

This will pretty much eat up most of your budget, but if you have any left over, get a good set of lightweight forged wheels (Volks have the best offsets) and some really good coilovers for track use. There's more if your budget allows, but that is a good starting point for a decent N/A tune.

 

Instruction will always outlast performance parts.

Usually has bigger gains too

 

Absent some training, if you push this car, you will bend it. She is an exacting mistress and does not suffer fools well.