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The N54 uses two small single scroll turbos. The N55 uses a much larger twin scroll turbo. It should not be surprising that the N55 will have a bit more lag, but sustains more power in the upper rpms. There are trade-offs with both setups. The lag is not bad at all in the 6MT cars after you've learned how to deal with it. The lag is nothing compared to what my 2012 WRX had. LOL Be happy you have the N55 from a reliability standpoint.
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