between $1k and 2K? heres what you do. we'll call this the "budget buildup." this is basically what i am doin to my X. go buy a high flow muffler (i like flowmaster) and have an exhaust shop make you a cat-back system. this will save some dough. go buy a K&N filter, and cut the factory airbox in half. i left the back part of the airbox on to work as a "heat shield". then, a Pro-M or Granetelli mass air sensor, and get an engine programer. (hypertech, diablo, whoever you prefer). dont forget to run a 180 thermostat and high octane gas with the programmer. then, check into getting a new cam and lifters, and some roller rockers. go with 1.6 rockers, not the 1.7's. if you can do the cam yourself, or get it done cheap, this will put you at the outer edge of $2k. the cam is were you will really wake the motor up. the stock one is a turd. replace lifters while you are in there, because if yours are not ticking already, they will be soon. go with the ford motorsport E-303 cam, or i can recomend one of the Comp cams. i just got one the other day (it will be this spring before i put it in) and from what i have been told it will work a little better than the E cam. if you have any more questions, feel free to ask.