It is a piggyback system and I would be VERY cautious about installing one that is generating 660+whp...which presumably is 120+whp over stock. What sensors does the ECU Tuning tie into? The biggest problem so far on the S63TU isn't fooling the DMEs to produce more boost....but getting the DMEs to deliver more fuel. If they haven't resolved that aspect of the tuning process, I would be hesitant to put that much power down.
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