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Old 06-28-2011, 07:55 AM   #15
Registered User
Join Date: Jun 2011
Location: ri
Posts: 66
My Ride: 02 325i
yup that is normal. the air that gets sucked in while you drive cant just stay there. its even louder if you have a cai. also if anyone is wondering a slight whistle from a cai is normal to. it usually happens when you press the pedal down about 1/4 the way !
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