its a module that reflashes the pcm. I know it at least holds 3 different tunes and you can make some minor adjustments yourself. It also can datalog and pull OBD2 codes.
Btw, I checked out brenspeeds website and he lists it for $379. You might be able to get it cheaper than that still. Actually, we just did a group buy not to long ago. Not sure what people payed for it. The price had to be removed in the thread since the price was lower than advertised on his site.
