BMW 3-Series (E90 E92) Forum > E90 / E92 / E93 3-series Powertrain and Drivetrain Discussions > N54 Turbo Engine / Drivetrain / Exhaust Modifications - 335i > AR downpipes, pronounced whistling / hissing noise accelerating at 75+mph?

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      11-01-2012, 12:58 PM   #67
ar design
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Originally Posted by cable96 View Post
yep, totally aware of that, the shop had removed them and checked both the gaskets and the dps, and the outside part was fine and hadnt started flaking either. By now i wouldnt be surprised if they are a mess.
Give me a call at the shop if you need any help/assistance.
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      11-10-2013, 09:43 PM   #68
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Any updates to this thread?

I just got my AR Dps installed and I can hear a really loud annoying whistle when spooling and on throttle let off. It's really loud and sounds like a spinning / whistling noise. This has nothing to do with turbo, I have never heard this before on my other dp'd 335. Leaky gaskets, clamps, exhaust? Any other ideas?
2009 135i 6AT
E40 PTF Protune, AR Dp's, 5" ETS FMIC, BMS DCI
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