^ If there is, its very insignificant IMO. Now what if u lead a pipe from the air filer box down to the hole in the bumper plug and seal the hole around the hose. Then let the wind resistance create a little bit of boost?
I remember someone on Vibe forum actually did that. I dont remember if it had any effect tho, but somebody calculated that at, I think, 80 MPH, its possible to gain over 2 PSI of boost. It maybe BS.... and it most likely is.... but maybe I should try it someday.