Need '99 GT "Boost" Advice
 

I'm new to the Board. I'm looking for some advice on how "kick up" my '99 GT. I'm looking at spending between $1,000 -- $1,500. The only thing I've done so far, is install Saleen springs and great after market sound system. I don't know the shorthand (i.e., 3.73, Mil's, chips, etc.), So, please be clear and descriptive. I will also need to know where to buy these parts in the Seattle area, via catalog or online.