tbh it's one of those things that it takes $$$ to play..
popular mods, are svt header, orp, flex, exhaust, intake, and tune.. the latter being the most expensive but makes a difference. also throttle body will give you a better throttle response. best way to save money is to keep an eye out on our forum here at the BST section.. a lot of good deals have been popping up.
fswerks, cfm, massive, focus-power, topspeed, and rps make parts for our cars and most of em are vendors here.
2000 Alpine White Turbo Focus
2003 Pitch Black SVT
Focus Revolution Club--Hatch Nation