It is everything you need. It is everything that came with it originally except for the box it came with. I also have the usb to serial adapter for laptops that do not have serial ports any more (RS232 just doesnt get the love it used to!), and can also be used to live log with the tactrix cable.
The unit will be unmarried of course and all the OTS maps loaded before it gets shipped out.
I would say that stage one you should gain about +20hp and if you mod to stage2 you'd see about +40hp from stock.