You'd get a lot more power out of it with a tune.
The N54 ECU has shown to be highly adaptable, and I wouldn't expect any problems. Probably just power gains, and a faster spool, with less heat and back-pressure in the hotside of the turbo.
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'08 Black Saphire/Black Z4 M Coupe
RIP Gretta: Blue Water/Lemon 135i. Died to save me.
-ChuckV
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