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I'd say it's a real crapshoot. Nobody can tell you the results of such a setup unless they've tried it themselves. And there could be unforeseen problems leaving you with a lot of expensive parts that don't do what you want. Is the ride on a non-sport E90 soft enough for you? If so, why not just go to those OEM springs and shocks? Maybe a soft set of touring tires with 17" wheels too. If the non sport ride is still too stiff, I'd switch cars and go to an F30, which is known for a much softer ride.
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