I wanted to keep most of my boot space and have a little doof doof thats looks reasonably factory, so I bought a pre-fabbed f/g enclosure that sits in the side of the boot rather than up against the back seats. Tried to get one made here locally, but for the price it was cheaper to get one flown in from the US. Only holds a 10" and is ~1cuft, but its loud enough for an old timer like me - the days of having no boot space with 3 x 12" and 3000WRMS running them are well in my past! Highly recommend these products, mine fit like a glove.

Excuse the mess, I had to take some rockwool boards to my workers on site.