1998 Grand Marquis o2 Sensor help!
 

I have had my Grand Marquis for about 2 years now and it has been a great car since i put a new intake on it after the faulty design came up with and put all new coil packs in it. I really need to know what kind of Oxygen Sensors are in the exhaust system. I have reason to believe that they are either Wide band or Digital Narrow-Band sensors. I really need to know for my new HHO cell i have installed and that im trying to perfect. The EFIE chips are $100, so i dont want to get it wrong, so can anyone help me out?
Thanks!