I thought about hiding it but was afraid of that gunk leaking under my dash.
I would like to hide it though. Did you just hang it on the fire wall inside the cars ?
There are a few places you could put it on the outside and still hide it. On the outside of the fenderwell, under the battery tray, on the front side of the radiator support behind one of the headlights...I even saw one guy cut the bottom out off a windshield washer bottle, paint inside the bottle blue so it looked ike it was full of fluid and bolt it on top of the box...hidden in plain sight