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Twin scroll is not literally like two turbos.
If you want to use the 'old' term for a turbo (turbine supercharger), then yes, there are two turbines. (I.E. a double turbine hot-side).
There is still a single compressor (normal cold-side).
(Not a bad thing).
It makes a little bit of difference, but I've never seen any numbers to suggest a twin scroll would dramatically change anything over a single scroll.
It's more like one of those 'every little bit helps' sort of things.
-scheherazade
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