If you go with either JLT or K&N you'll be fine. They both will give you the same noticable results and will give you the max peformance out of a cold air kit on a fairly stock car. I personally bought the K&N CAI last week and installed it on my 03 gt that is stock except for 4:10's. Prior to installing my CAI i cut my airsilencer, cleaned and installed an old K&N off my 98gt. I drove that for while. Didnt really notice much of a difference. Just felt piece of mind. Now after installing my K&N CAI, there is definitely a difference. The car seems to pull a little harder when accelerating. It is not a huge difference like gears or anything, but it is noticable. And the filer is much larger than the standard K&N replacement.
Tony
2003 GT
4:10's
K&N CAI
Next pullies, plenum and throttle body.
20's look great but slow my car down!
