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Yeah, if you want to replace the amp, I think Bavauto has a solution. There may be others. I found the stock amp to be fine, but wanted to upgrade the speakers (particularly the tweeters). If you don't go with a set designed for the x1, then it's up to you to figure out what works.
I'm not sure if the woofers are any different for HK -- it could just be the tweeters (and the amp, of course).
I have a simple, old-school-style, GPS in front of the cubby for navigation. Works OK. Phone is a backup...
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