Just this past weekend on Horsepower TV there was some import tuner guy showing how to do mods on a 93 Civic. In particular he did an intake, exhaust headers and complete exhaust. But he made one huge mistake...he actually dynoed it after. The result? 10 hp.
Too bad he didn't dyno it after installing just the intake. I would presume the sponsors of the show would have been pretty embarassed to see their intake generate maybe 1 hp.
Don't waste money on intakes.