Mpg

Personally I liked the one advertised as a mini supercharger.
It was a carb spacer with a little propeller in it. Two propellers if you had a 2 barrel
I bet a four barrel would have been awesome hey?

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You mean one of these?

20% more gas mileage!
boost horsepower!
Greatly improves performance!

$9.95 single throat carb, $11.95 double throat carb, $15.95 four throat carb!