mighty big wing for a car that probably didn't reach very high speeds

you'd need to be around 90 for that wing to be getting effective...  I'm just sorta guessing, so, I'm further guessing that it didn't go that fast very often. Just a guess. 

https://www.facebook.com/photo/?fbid=10225432136830623&set=gm.2955211774672053&idorvanity=527146584145263