>Does anyone have any suggestions for improving the quantity of air that can
be sucked into the >2.1L WBX engine?

I would think that the heads restrict more air than your air intake.
Personally, I wouldn't spend any money on fancy (read: ricey) air intakes
until the heads are ported and polished.

Now, if you simply want to provide the coolest possible air to your engine,
making sure that the stock setup is top condition will go a long way.
Simply make sure your intake is not sucking the hot air from the engine
compartment.

Just my 2 pfenningen.

Chris,

'85 Westy.