guys,
I have a stock audio system and last year I replaced the front/rear door speakers with MB Quarts..(not the subs)

also added a second amp...

still don't like the sound..

i need kick ass sound...

what are your recommendations?

I want to maintain the stock look but need to get more bass... and would like to install larger speakers in the doors...

BSW still doesn't have a kit for the E70...

any ideas?

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2012 X5 50i M-Sport
2014 X3 35i M-Sport