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      08-01-2012, 01:02 AM   #1
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2012 640i Coupe

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So with BMW's TwinPower Turbo, what happened to the whistle? Aren't I supposed to hear a whistle when revving hard enough? Are there really two turbos in the coupe?
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      08-01-2012, 05:05 AM   #2
Superspeed
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It's one turbo with double inlet ("twin scroll"), which optimises the flow.
I've never heard any whistling from it - and don't miss it
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      08-01-2012, 06:44 AM   #3
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upgrade your downpipes and here will hear all the whistling you can ever ask for plus free up lots more power
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