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      01-20-2012, 08:23 AM   #10
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Drives: F80 M3, F10 535i
Join Date: Dec 2006
Location: Charlotte, NC

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2011 335d  [0.00]
Originally Posted by NJ 1161 View Post
I already have the rear exhaust boxes removed for the m3 style exhaust so just have straight pipes on the back half. Not that loud really and certainly can't hear the turbos.

Will try the filter and heatshield when weather gets a bit warmer.

Some Diveter valves give of a little whoosh and whistle without the big pish bangs!!? Are these even available or fitted to a 335d??

So, guess thats it then, no other ideas chaps???
I don't know the attitude towards them in the UK but, in the US the blow off valve (diverter) is generally the first thing ricers do to their factory turbo cars and frowned upon unless you are making enough power that upgrading the valve was required because it was leaking boost.

So... I venture to guess that most 335d owners have not pursued this mod. And yeah that's pretty much it for getting more sound out of the turbos.