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Interestingly enough the sound in mine started when I had the OEM downpipes swapped out with the catless DPs (at least that is when I noticed it). Your sound is DEFINITELY louder than mine but it's the same "bird chirping sound" and the sound would come into play on mine when I revved it.
I am really interested to know what solution your dealership comes up with because I am going to re-visit my car to see if the sound is still there.
Brian
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/// 2o13 m6 f13 . jb4 tuned . meth injected . msr intake . 21" adv1 wheels . eisenmann race w/ catless DPs . vorsteiner full aero . accuair e-level w/ bagged KW V3 struts . dinan sways . bel stir+ w/ alp jammer . jl audio subs
/// 2o13 x5m e70 . velos tuned . 22" adv1 wheels . dropped on kw variant3 coilovers . passport 9500ci radar & jammer. gets groceries fast
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