How to install a vortex generator. All I know is that it install after the air intake filter. And does it really works?? Should I waste my time on it?

 

Do a search. This has been discussed before.

It's total snake oil, don't waste your money.

 

^ He's right. ^
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If it were possible for these devices to increase both power and mileage (both huge selling points) for just a few dollars, don' t you think the manufacturers would have put them in the cars in the first place. I am constantly amazed when people fall for these scams.

EPA Article

Consumer Reports

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