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QUOTE (Box @ Apr 15, 2013 - 11:59 AM)

>The only way you're going to maintain power is to make a cold air box to go with it, that or move the filter down into the fender arch. The best option for making power would be to put the filter in an area where cold air is forced into it. Though that'd require body modification or putting the filter in an area susceptible to sucking in water. With a stock 5S those gains would be marginal at best and not worth it. Believe it or not the people who designed all of these cars knew what they were doing. If you think about it the stock units are cold air boxes, but with a panel filter. Most factory boxes even have ducting that draws air from the bottom of the car. So contrary to popular belief, odds are you're better off with the factory intake. More noise doesn't equate to more power. If you're just wanting the sound you can remove the resonator.
^What he said. Majority of the time factory intakes are the best for most cars. The only way you'll get some power out of a 5s is mod the cams along with I/H/E. Or go turbod. The weak spot of our 5s is in the intake and exhaust ports. Something we can't really mod.