Cold air intake? If you can't eliminate your EGR valve (because of smog checks), then your smog pump is injecting hot exhaust directly into your intake. I did the BB bypass method while eliminating the smog pump belt on my 92 and it responds/performs much better in the heat of summer. Colder intake temps for sure, my 92 loves it.
80's come from the factory with a Cold Air Intake. The inlet is in the fender, not in the engine compartment. Plenty of threads on the board. As said above, the only way to improve is by adding a snorkel, which will give you cooler air in the summer, but reduce any gains from the drop in aerodynamics.