dual 8's in the E30?

has anyone done 8 inch subs in the trunk? I want to have good bass and clean sound, but having my 12 in there how it is now won't allow access to my spare tire, and there is almost no usable trunk space. I was planning either 2 8's or a 10, I would prefer to use the 2 8's as the boxes could be made more shallow for them, allowing more trunk area to be open. I plan to use infinity kappa 6x9's in the rear deck with custom sealed enclosures for midrange and midbass, but I need something to fill the low end of the range. also, if anyone has any tips for doing 6x9's, let me know. Thanks!