I pulled up the Wiki article on "Short ram air intake".
Quote:
The short ram air intake is a form of aftermarket air intake for automobiles with internal combustion engines.
It replaces the OEM air intake with a short metal pipe and a conical air filter inside the engine bay. A significant increase in intake air volume will only occur in an engine where the factory intake piping was restrictive.
There is still some open debate on this issue, but some believe that a problem with short ram air intakes is that the air entering the intake is at a higher temperature due to the proximity of the engine, which may reduce some power. This may be partially offset by an increase in the volume of air entering the engine. To counter intake heat problems, many short ram intakes include some form of heat shield. Moving the intake inlet port further away from the engine block will also help to alleviate the problem and some users use a cold air intake where the inlet air is at or close to ambient temperature. However, others claim that Short Ram Intakes (SRIs) or similar Warm Air Intakes (WAIs) offer benefits over Cold Air Intakes (CAIs) which include better MPG due to a more complete burning of fuel.
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You could still improve it by moving the intake closer to your exhaust manifold. Oddly enough, I don't think I've ever seen a Civic stock air box so I'm not sure if it pulls air from the fender well or not, so it would be at best a guess as to whether the SRI helps.