I put the AFE on mine and it has a slight whir right after startup, but after the idle smooths out, it goes away. You will probably hear more of a whooshing sound as it is sucking the air in much more efficiently now.
Mine does it also but it's only noticeable with windows down and the hood open (which is basically only when I'm playing around under the hood)
2006 XK Limited, 5.7L Hemi
Airaid CAI, NGK V-Power Coppers, RR 2.25" lift, Spidertrax 1.5" spacers, 255/75R17 BFG MTs, RR Supersliders, Large Green Insects
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Gone but not forgotten: '89 YJ, '99 TJ Sahara