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I haven't done the upgrade myself- but after looking at what's included, and reading other reviews (the alpine kit is the same on all bmws) I'd say it's a kick as upgrade.
Things to note. It'll take 2 1/2 hours for a dealer to fit + coding. High will cost £200-400 extra. Fit it yourself then get them to code it.
Keep us posted- I want to do this upgrade as well
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