I'll see your nice-looking WAI and raise you one ghetto WAI:
Yes, those are tin cans with sheet metal screws and a coat hanger on the end of the intake. Oh yes, and duct tape. Winter beater Metro!
Despite this and a 100% grille block, I only managed 52 mpg US / 4.5 L/100 km on my last tank.
Needs a coolant heater. I need to start a fuel log, too.