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BMW 3-Series (E90 E92) Forum > E90 / E92 / E93 3-series Powertrain and Drivetrain Discussions > N54 Turbo Engine / Drivetrain / Exhaust Modifications - 335i > Hissing noise from the near surrounding of air intake



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      12-03-2019, 04:01 AM   #1
Darek335i
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Drives: BMW E90 335i N54
Join Date: Dec 2019
Location: Poland

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Hissing noise from the near surrounding of air intake

Hello Guys,

My name is Darek, I live in Poland. I am a proud owner of E90 335i N54.

My car has a map for 350 HP. One week ago I let my car mechanic install 3' catless downpipes. Just after this mod I started hearing a hissing noise while accelerating (close to airbox). I recorded 2 movies for you to show the problem:




Can it be leaky charge pipe? Is there any chance that this noise is "normal" after changing downpipes? I notices 0 power loss.

Thanks in advance!
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