Ah yes, with the big flaw - VW had louvered vents reversed on their 311's (Type 3) and 411's (Type 4) (shown here), which MINIMIZED air flow to the air-cooled engine. VW said it was not mistake, but they eventually produced a louver that, after you cut out the reverse-louvered section of the car, was pop-riveted in. Results of the engineering flaw were at worst total engine failure. My old 311 ended up with warped heads.
