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missed this one, the twin scroll is all about tuning, it keeps one exhaust pulse from reversing back to the head. Like a log manifold for example, shitty tuning since all the exhaust feeds into 1 log, a twin scroll lets a V6 or 8 stick 1 pair of header primaries into one side without worrying about the pulse from another reversing back up it, very good setup to use.
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