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It has got to have a ram air effect.


Not unless you are going 100mph or more.

The Ram-air myth is a bit of a peeve of mine. Here is a pretty good explanation:
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The ram-air pressure created by the forward motion of the car is proportional to inlet air density and the square of the velocity. Using conditions at 1000-ft elevation and 70F gives the following results:

Speed "ram pressure"
77-mph ( 0.1 psi )
109-mph ( 0.2 psi )
134-mph ( 0.3 psi )
155-mph ( 0.4 psi )
173-mph ( 0.5 psi )


Hence "legally" all one can expect to gain is a 0.1 psi increase in intake pressure (note this is a far cry from the 6-psi+ pressure increase that turbo's and superchargers produce). This increase in pressure is added to the ambient pressure of 14.17 psi raising it to 14.27 psi. But this is a less than a 1% increase in inlet pressure. This trivial increase in pressure would increase mass flow through the engine by a similar amount - yielding a 1.2-hp increase to a 170-hp engine.

1991 Mitsubishi Pajero XP TD LWB family hauler.