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i think you will be completely fine with anything around the 500w range.
I plan on putting in a JL 12w6 with a JL 500w amp in my 2012 X5M, JL makes a great product.
with a 300w amp, i doubt the X5 will even notice its in there, you will be fine... just get someone to install it who knows what they are doing, that's more important
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