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there wont be a turbo for the E90 in any near future, if ever. The ECU will not take well to turbo FI (centrifugal SC's are easier to tune) and even the E46 doesnt yet have a turbo application for it.
Add into the fact that people can now just get a 335, chances of E90 turbo are slim to none.
And for reference, an E90 turbo kit would cost between 7-10K, based on history of BMW FI.
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