I haven't seen too many SVT Focus owners on here (even though this is the "SVT" section) - in case nobody comes along to help, try checking out the following:
The best thing to get would be a tune. I put an intake, TB, tune and ignition on SVTF and the only real power came from the tune. A CFM TB gives better response too. I havent heard mant power gains from an intake or exhaust on a NA SVT.
I got an 03 svt focus for a daily and from what iv heard for bolt ons ur best bet is to go with an off road pipe, tune, and underdrives.... theres some debate on the underdrive pullies because the crank pulleys for the kit has no dampener but u can read up on it and decide for urself....but out of them the best to go with i have heard is the tune.....