The factory intake is a cold air intake. It's not restrictive either as long as you use a GOOD filter element in it. Removing the passenger side footlights and making sure all of the under covers may increase air pressure when already driving at speed but even with an elaborate duct you're not going to see any massive increases in power. Keep the helmhotlz resonator and don't increase pipe diameter as it reduces air velocity which is more important on a non-turbo. I've written a lot about all of this on here before.... might be in the. FAQ thread about cold air intakes.
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