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This was a common mod for my X5M (S63) to swap in the M5 turbos and exhaust manifolds (S63TU). The S63TU has twin scroll turbos. The N63TU/S63 does not use twin scroll turbos, and has an entirely different intake setup and exhaust setup. The S63TU does not use MAF sensors and uses an array of sensors to calculate air flow as the MAF reduces airflow by nearly 1/3.
Basically I've never seen this swap done without reprogramming. The engines have a lot of simularities, but there are a lot of differences between the S63TU turbos and N63TU turbos.
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