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The E9X is the 4th evolution of the BMW 3 series including a highly tuned twin turbo 335i variant pushing out 300hp and 300 ft. lbs. of torque. BMW continues to show that it sets the bar for true driving performance! -- View the E9X Wiki

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Old 03-26-2018, 09:46 AM
elementmg elementmg is offline
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Location: Canada
Join Date: Mar 2018
Posts: 2
Mein Auto: 2007 E90 335I
Extra Loud Turbo Scream

Hey Everyone,

I bought my 335i used a year ago and its always made this whistle while under heavy acceleration. I'm wondering if this is normal? I assume its the turbos but i've never heard a car fly by me with this loud of a whistle. They don't have a siren and they sounds completely fine and normal other than the incredibly loud whistle under heavy acceleration. When i rev it in park or neutral it sounds fine. No whine or whistle.

Just want to be sure there i'snt an issue, and if there is... what it could be. Turbos starting to fail? Boost leak? maybe im just paranoid? Check out the videos

Car is a 07 335i
Dinan 3 tune
Catless downpipes
Dual cone intake

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