Nice Gen 1 D as well

 

My thought is that a tune (regardless of Diablo or Hypertech) and a CAI are your best, low cost add-ons. I had the exhaust first, no noticeable gains. Added the Diablo InTune, and moderate noticeable gains. When I added the Mopar CAI, it REALLY opened things up and now I feel an appreciable difference.

So my 2 cents is an intake and tune first, then the exhaust later.