Quote:
Originally Posted by X5Sport
I think for the N55 it may be a single 'twin-scroll' turbo system and the redesigned exhaust manifold which divides into two three cylinder sections to feed the turbo. Could be mistaken though. Supposed to improve the breathing.
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The only thing you're mistaken about is the reason for the setup you described, which is correct. The reason to do it is to improve turbo spool time / response.