Your stock intake is the best bet for a true "cold air intake". Any intake which has an open element under the hood will draw in warm air. A scangauge II will show the intake temperatures and verify what I say to be true.
If you do indeed find a good sealed air box type intake system, it will be near 300.00
Best bet is to find the intake inlet behind the headlight and increase the diameter, thus allowing more air into the box.
However, the real restriction is the exhaust manifolds. you aren't going to get anything in, unless it can get out. Without higher flow to the exhaust, the intake will not do anything to improve performance.
Save the money for torquemonster headers from Al's headers. The
#3 port on your stock manifolds is about 3/4" diameter.
#4 is slightly larger.
And stay away from the k&n filters. Not only do you have to wait 24 hours for it to dry out when cleaning it (leaving explorer down for the count) but the oils used on them will contaminate the maf sensor, and cause nothing but headaches.
The cleaning solution and oil used for reconditioning is more expensive than a plain paper filter, which actually filters better.
