I have a 2016.5 GT CX5 Bose system. My passenger side door sub-woofer is blown. It seems simple enough to change out but my question is what have you used to replace that sub with? I would like a better sub if possible. I am not looking to upgrade the amp or head unit, just the 2 front subs right now. I read they are 6.5" and then others say 9", what have you all used. Thank you.