i know the outputs of the Bose amp are differential type outputs...if i recall...some had issues tapping an amp off of them....vs using some sort of line processor...
i think someone has a single sub box that fits in the left hand side of the trunk...behind the trim panel...not sure...might want to do a search...i know s**bth**mp has a single sub version of the sub box i have...
here is my system
http://www.camaro6.com/forums/showthread.php?t=497975