does anyone have an apexi s-afc in their evo and know how to tune it.I have one in my car and my car runs about 20-21psi of boost.could anyone give me some ideas or actually write out how to tune it.cause i bought it used and i have no idea how to use it.i just take it to the mechanic and he tunes it.
but i would like to have an idea myself ..you know..