MAZDA GT cars - What engine?

[Renesisking]

gotchya, i've seen some people run them without the box on top, i've always wondered this however, since there is no intake to properly distribute air evenly to each chamber, couldnt one be working more than the other??? also, how much more performance can you gain since your only sucking air from the engine when you'd want cooler air for better performance.

[Turbo II Rotor]

Originally Posted by Renesisking

gotchya, i've seen some people run them without the box on top, i've always wondered this however, since there is no intake to properly distribute air evenly to each chamber, couldnt one be working more than the other??? also, how much more performance can you gain since your only sucking air from the engine when you'd want cooler air for better performance.

The air box is sealed to the hood and open at the rear to take advantage of the high air pressure zone at the cowl. That intake is drawing fresh air and it's being forced in at speed. Without the air box you would be drawing in hot engine bay air and you would have higher intake temps which would be less than optimal. The box is a much better design.