Can someone explain why there would be two air valves on each wheel I noticed this on an evo the other day.

 

im sure its been cover before...but its so you can monitor tire pressure while adding or removing air

 

In racing many teams use Nitrogen. Nitrogen has larger molecules than ambient air and is less likely to "seep" through the pores in all tires. It also is less sensitive to temperature so the PSI stays more even as the tire heats and cools with track use.

The two valve stems help in exchanging ambient air for Nitrogen. One stem is used to bleed off the ambient air while nitrogen is put in the opposite stem.

This look is popular in Japan and was requested by many customers.

 

Was the Evo set up for rally? If so it could also be for the blowout liner that rally teams use (used to use - i think it may no longer be legal in some classes)