well water injection like i said...people are gettin 15/20hp just slapping it on. i have a kit sittin in my room that i just havent got to yet, but once i have time its def goin in. then you can get crazy wit leaning it out and adding other stuff like methanol.
-you can save for the turbo kit
-save up and get nitrous
-water injection cost anywhere from 285 to 1k...
of course that a baseline kit up to top of the line aquamist/erl stuff
-you can set it up to shoot the intercooler like im gonna try to setup, but its designed to actually be shot into the upp to cool down air temps and allow more timing. like i said i want one solenoid to spray the intercooler like stg2, but im also shooting into the upp
-how hard is relative question really. ask jay how hard anything is and ill tell you "oh, its eazy" but depends on how you are with installing stuff. if you are comfortable with:
-drilling and tapping a hole
-soldering up wires
-fitting the pieces in ur car
then i would say yea you could do it, it will still take a good portion of the day, but thats the fun part