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Bimmertech is the option I went with to upgrade the hi-Fi system. The primary reason for going the bimmertech route was that they offered an Amp where bavsound did not at the time. The amp can be tuned via a laptop or they will send you updated tunes on request.
I also replaced the subs, center and rear deck speakers with their alpha ones mid and tweeter. I went with the after market B&W speakers in the doors for the ambient lights.
Can't really say how it compares to bavsound or a factory B&W but for me it works just fine.
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