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The N55's single turbo is the bottle neck in the equation. It just doesnt flow as much air as the 54's twins.
The reason why a larger single on the N54 out performs the OEM twins is due to its size. An aftermarket unit doesnt conform to what BMW needs a stock car to. Idle, low end power, drivability, fuel economy, emmissions all suffer at the expense of top end power. Look at aftermarket Supra tuners, they've been doing it for many years.
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