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The AEM 21-544C is a cold air intake system for the 2002–2006 Nissan Sentra with the 2.5L four-cylinder. It replaces the stock air box with mandrel-bent tubing that draws air from outside the engine bay, and it uses AEM's oiled Dryflow-style cotton-gauze filter. It suits Sentra 2.5 owners who want a louder intake note and a modest top-end gain and who accept that the filter sits low, where it can pick up water and dirt. Against short-ram intakes it trades a little low-end response for cooler air; against no-name kits it brings AEM's fitment and CARB-exempt paperwork.
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Owners of the 2.5L Sentra report a sharper throttle and a more aggressive sound after fitting the AEM kit, with most calling the install straightforward. Complaints center on the low filter placement and on the cleaning routine.
Cold Air Intake System by AEM (21-544C)
C.A.S. NISSAN SENTRA 2.5L L4 02-06
