BMW shouldn't really be scaring you into not upgrading your stereo, maybe scarings too strong a word, planting the seed of doubt may be a more appropriate term. The Apline upgrade is going to be the safest option but, they would have to show something you've done caused a fault if you went another way.
Providing you take your time and use good quality components youre fine. I can't recall seeing any threads of people having any problems with adverse damage. Saying that though a couple of years ago my brother bought Parrot head unit from Halfords and got a free fitting offer. The guy blew two units one after the other in front of him and started a small electrical fire just connecting them at which point my brother told him to do one. Clearly a moron.
It's quite right though and only fair that if the worst did happen though why should BMW foot the bill?
What are you main wants and what is your absolute budget?
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F31 335d M Sport XD - Mineral Grey - Coral Red - 19" 442M - HK Audio - M Sport Plus Pack - Heated Seats
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