Ummm I picked up 1mpg on the highway. Dropped my IAT 50-100 degrees. Dropped my EGT's a little over 100 degrees. So they do make a difference.Ram air will not work any better on a turbo intercooled vehicle.
Other than the look which may be desired think about what ram air does for a sec. The scoop sits in a high pressure area to pressurize the intake system and get additional flow. The turbo was made part of the intake system to increase pressure and flow. So how is a few psi before a turbo going to make any appreciable gains? It will not give any cooler air nor any more "boost" by the time it reaces the combustion chamber.
1 MPG is negligable IMO and could be down to consistancy in the measurement and driving. As far as the other measurements you have the data and I don't. Could be down to intake modifications and not so much to the "ram air" effect.Ummm I picked up 1mpg on the highway. Dropped my IAT 50-100 degrees. Dropped my EGT's a little over 100 degrees. So they do make a difference.