So you want to know what else you can do to your civic?
Under body of course, smoothing it out as it accounts for a large part of the aerodynamic drag, smooth wheels because the top half of the wheel/tire is heading in to the oncoming air flow, thus it's seeing twice the air speed! being a civic you have a number of options, smooth wheel covers, or choosing a stock honda civic wheel that was mostly smooth, the Honda insight from 2000 to 2007 had smooth light wight 14" wheels, getting low rolling resistance tires to go with them would be worth it as well.
You have a Scan Gauge, so you can try warm air intakes and compare it to your cold air intake, but as most people will tell you, they see it as being worth while to go with the warm air intake, it's solid science behind it as well, just like exhaust sizing is based off math so you can find your ideal exhaust size.
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