I am selling my smc-500 it is a fuel controller that works on civics, integras, accords.You can adjust fuel trim from +59% to -59%. The unit can be used with up to 450cc injectors. You can control fuel trim on smaller injectors as well.
It is great for turbo applications and also would work well on naturally aspirated cars.
I no longer need it, great operating unit and very user friendly.
Here is a link and more info on the unit.
http://userwww.sfsu.edu/~ecg/SMC/smc500.htm