[sluflyer06]

Have you thought perhaps about some kind of custom molded enclosures that might fit under the seats? You'd easily get away with 10's under each seat since they'd be in the cabin and not the trunk. There is or was a guy on NASIOC that used to build them for the WRX/STI's, you'd take the seat out, install the box and then put the seat back in.

You'd lose weight and move the CG of that weight low and center...just an idea.