Of course, but given the modern car's lack of space, and small box for
the filter, stacking them is not possible. On the other hand, manufacturers
have done some interesting things. On a GM from the 60's there would be
a round filter box with a short stub pointing off to one side. Today,
the intake system consists of a tube mounted so that it takes in fresh
air, feeding to the filter box, which is square. The box, of course, is
connected to the throttle body. But what is interesting is that the air
is fed into the top of the filter, so that a lot of surface area is
available. Add pleating and the filter is actually a lot bigger than it
would appear to be at first glance.
"They that can give up essential liberty to obtain a little temporary
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