Tornado insert
From EcoModder Forum Wiki
Popular Mechanics and UTI dyno tested this and other such products and mods. For this particular product, the TornadoFuelSaver, they cite a 10% decrease in peak hp and found no conclusive difference in fuel economy. What do you expect from an air intake obstruction?
http://www.popular-mechanics.com/cars/alternative-fuel/gas-mileage/1802932
