I know this is an old thread, but in case anyone else is having this problem, here is the solution:
I found and used these on my '03 before I sold it. Worked like a charm. It just so happened that the guy who makes them was located near where I live so I was able to pick them up in person and talk to him about them a bit.
The install itself is not bad. Unless you want to pull the dash apart and remove the airbox, cutting the access holes under the dash is a real PITA but well worth it.