i hate to tell you this dude but you arent going to make a beast out of the focus with bolt ons. the exhaust you got was a waste of time and money sadly. you might have picked up 1hp from it, not joke. if you want an exhaust power upper you need at least 2.25 inch exhaust and 2.5 inch would be better. the SVT header is still carb legal. hell its a FACTORY EXHAUST MANIFOLD! use the SVT header with SVT cat and flex pipe and they cant say jack squat to you at emissions time. it is a factory ford "header" and will pass emissions just like normal if you have the o2 sensors plugged in and have the cat. the header alone is good for 15whp and that is substantial when the car might make 100-110whp as it is now. the shorty header might be good for 3whp over stock.
as far as making power goes. if you want to whoop some civics and you want to do it on a budget you need nitrous and you need a tune. nitrous is the biggest bang for you buck hp that there is. spend you money in the right places and you could possibly DOUBLE the hp of your car for $1000 or less. a 100-125 shot on a bone stock engine walks off and leaves stock and lightly modified GT mustangs even if the focus has multiple passengers [hihi]. $700 should get you what you need for hardware (bottle, lines, solenoids, switches, safeties, WIDEBAND air/fuel ratio gauge, CFM fuel rail adapter, etc) and then a tune is absolutely necessary before running a big shot. you could run a small shot untuned and be okay if you run a wet kit and run with a bigger fuel jet than nitrous jet, and keep a VERY close eye on your A/F trims.
if i remember correctly tom charges about $100-$150 more for a nitrous tune than he does for a N/A tune and you still get free tune updates for as long as you own the car.
other than nitrous your only options for adding any substantial power involve pulling the head off and getting it ported and decked for better flow and more compression which will require you to run higher octane fuel, will require a tune, and wont be cheap. you could pull the valve cover and take the cams out and replace them with stage 2 cams of some brand of your choosing on a factory head. if you put cams in a ported head i would get the most aggressive cams i could lay my hands on. but once again that can get expensive, requires DYNO tuning to get the cams dialed in and you will have to pay at least $100 for a set of used adjustable cam gears or twice that for a new set.
you could always lay hands on a supercharger too. you can bolt it on to a bone stock engine, tune it and run it for years with no problem so long as you get a good tune. now forced induction tunes (turbo/supercharger) from tom are pricey. methinks it costs $400+ more than a N/A tune but once again you get free tune updates even if you go back to n/a.
