Originally Posted by rodeofan5656

im thinkin it does the same as the old Tornado air dealies i used to see on TV. you install it in your intake hose/pipe like this, but it was a stationary fan. all it does is spin the air. the only good thing about is that i can think of is that it will help mix the fuel and air (creatin turbulence) in the cylinder before ignition. but all that does is help to burn most of the fuel in the cylinder (by atomizin it more) and spread the combustion pressure evenly on the piston crown. MAYBE better mpg, but not really a power increase..

Originally Posted by NWBackwoods

The later model 4.3's (and other models) intake manifold and heads do this anyway, hence the name 'Vortec.'

Originally Posted by cleburne red

But it doesn't mix the fuel and air. It is way upstream from the fuel injectors. The fan deal goes in the intake ducting, ahead of the throttle body. The injectors squirt into the lower intake manifold.