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For one its a header, you only have one. Also it sounds like you probably don't have a resonator anymore and now you don't have any catalytic converters to absorb any sound and can be loud. Like said above get a resonator put on to absorb some sound.
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2005 Altima 2.5s [WAI w/AEM dry flow] [4-1 Header] [PnP Throttle Body] [Racingline ground wire kit] [TB Bypass] [Bosal Muffler] [Tint all around] [Blacked out grille, gauge cluster rings, shifter surround] [Debadged] [White led dome light, step lights, license plate lights] [Silverstar front turn signals]
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