The idea behind this simple drop in product, is that it creates a vortex of incoming air for better fuel efficiency.
www.myauto.tv (sales site)

Anybody tried this or have comments on the technical merits?

I wonder if altering a beer can would produce the same effect?

__________________
1979 300D 220 K miles
1995 C280 109 K miles
1992 Cadillac Eldorado Touring Coupe 57K miles SOLD
********************
1979 240D 140Kmiles (bought for parents) *SOLD.
SAN FRANCISCO/(*San Diego)
1989 300SE 148 K miles *SOLD