Its been a while since I posted here, as I have sold my 850 and bought a 98 750iL so now I will be posting in the 7 series

I found 2 M5 OEM M Audio Subs and bought them to install them in my E38 as the bass is a little poor even with the DSP system there. so I wonder if anyone got an idea if those subs can be installed in the rear shelf or with little modifications. links would be fine too.

Thanks