I just purchased the SWS-8xi subs and a Rockford Fosgate p300-2 amp. I'm having it installed on Thursday.
The amp is a Class A/B so I'm not sure where it should be mounted: in the trunk compartment or upside down under the rear deck.
Suggestions will be helpful - I'll also report back after the install.
2016 F80 M3 | Mineral White - arrives October
2011 E92 M3 | Jerez Black
2001 E46 M3 | Carbon Black - sold