the weird thing is it has a power feed going to some kind of plating near the radiator. only thing i could think of that would require power there and have tubing would be a hho generator. not that hho works but there are kits out there... it also has a bunch of bolts sandwiching the plates which is similar to how stainless steel plates are sandwich when used to produce hydrogen.
after a bit of googling im almost sure its an hho generator. take a look at these and tell me if they dont look identical
if it is a hho generator you should run some tanks with it on and some with it off and let us know if it makes any improvement in your milage. i dont suspect it will but its always good to have actual proof whether or not something actually does or doesnt do what it says. theres so many articles explaining why these will or wont work itd be great for some real numbers.