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Whistling Noise while accelerating

12K views 17 replies 7 participants last post by  zjay--  
That's normal, any intake with an open element air filter will make that noise. The whistle is due to air rushing around the throttle body blade. The whistle comes and goes based on throttle position. Both my sri and cai whistled anywhere from 3400-4000 rpms

If it's a belt or pulley, it'll sound more like a squeak. A vacuum leak could make the whistle as well, but my money is on that aem intake.