Ideally for cost effective modding, it would be best to do all your research, know what you want, then order @ the best price , possibly from one/best source (helps keep ship. to min.) So lets get some feedback in current day market , @ July - Sept. here is the list: 1. CAI - Injen + shield? , Stillen w/Z tube , or JWT w/Z. 2. Crawford Plenum. 3. U.R. crank pully (or kit?). 4. Eibach (or H&R) low. Springs. 5. Strut tower brace - Stillen. 6. (for those with DEEP pockets) Super Charger! Stillen - ATI - Vortech.