No.
They're supposed to make a "tornado" out of the air. They swirl it so it gathers together and moves faster?
What happens when it hits the corners in the intake piping? the throttle plate? the surge tank? splits into the intake runners? through the valves?
all of the vortices are lost and you realize, "wow, i'm not getting any better gas mileage"
or, you install it and go "OMFGWTFBBQ I GET MUCH BETTER GAS MILEAGE AND I GOTS MAD HPzzzzz!?!?!!!"
either or, you decide.
I think ebay needs a slogan.
"A sucker is born every day.
shop eBay."
__________________
|