It is made by Simple Digital Systems. I am not running it, but I "here" (PCE Harry Wagner, reporting for duty <IMG SRC="smilies/biggrin.gif" border="0"> ) that it is just that, simple. Which is good when you are hooking it up, but I have heard complaints about how it works when the motor is cold or at anything but wide open throttle.
If you are putting fuel injection on a 22R, it is my opinion that stock is a better option.
CAZ has a good write-up on 4x4Wire, and
BlacknTan had really detailed information on his site, but I just looked for it and I couldn't find it. <IMG SRC="smilies/confused.gif" border="0">