I was looking through a rockymountainatv book and saw something that is called dial a jet.And it claims it is basically like a efi system.Its only like 65$.It looks like a tube that goes from the float bole on the carb to something else and using gravity to get to right mount of air and fuel mixture at any alltitude.Anyone saw this.Is it to good to be true?

 

It is no where close to EFI. It does work good on alky carbs in my experience.