what do i have to do to make a four banger faster
 

I own a '84 four banger and have wanting to make it faster but i dont really know what to start with andcan you make a four banger as fast as a 5.0 i if you can help i would really like it thanks

No, you can't even come close to V8 power with a naturally aspirated 2.3. You have to respect the 2.3 Mustang for what it is: A nice dependable car with decent pickup (for a 4banger) and kickass gas mileage (and great looks). If you just want a little more speed, buy a nitrous kit, and give the 2.3 a little shot (25-30hp). If you want serious speed, drop in a 2.3 turbo engine from another car.

A couple of other options I should have included: Rear end gears: swap out the stock gears for 3.55s or something higher. This will really help seat of the pants acceleration and feel, but kiss your excellent gas mileage goodbye! I personnally haven't done it and won't do it, but alot of people do. Exhaust: buy a high flow exhaust system. In some states you can even drive around with no muffler! Good for maybe 3 hp. Drop in a K and N airfilter. Flows more air- might give you 1 or 2 horses on your 2.3. Or you can do them all. For the exhaust work, gear swap, and nitrous installation you could take your car to reputable local shops if you can't do it yourself... just call around first. That's about all I can think of for now... Good luck.