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Regarding the potential of the S55 as the OP inquired about, well, where do things stand with the N54 today on stock turbos? The S55 should be hitting those levels at least in short order. I believe the S55 has forged internals also, or at least a forged crank, so that too may open more doors. Not sure if Valvrtronic is more win or break even or detriment from a tuning perspective.
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