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My understanding is that modern turbos have all but eliminated turbo lag due to the use of things like variable vane and twin scroll technology. If it hasn't been completely eliminated, then it's up to the clever people at the engine factories to find solutions to that problem.
Whether or not they have one, two or whatever number of turbos, I'm sure that they will seek to make them as efficient as possible anyways. Having the need for fewer turbos would be a step in that direction.
Pleased to see that V6 engine is being looked at (less room for turbos though).
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