id drill a hole in the part of ur box touching the bottom floor of ur car and drill a hole in the metal at the same place, place a bolt down and screw a nut to it on the bottom. also id make another baffel that has a hole just as big as the outter diameter of the sub...countersunk subs are hard as fucked to get out lol, especially when its bolted down
im from oakland,ca so need i say more? my system got jacked, and was pissed, so my new system 2 amps and a sub are all bolted to the car wit uni-strut, and u can use L-brackets as well wit it. in mine the amps r standing on each side of the sub box, with there own lil structure thats drill straight through the frame of the jeep, so the nuts are under the jeep covered in tar haha make it even more of a job to take
i heard that in some parts of new york, people actually take their steering wheel with them. also some people actually put a sign on the window saying there is no stereo inside so people won't break in to the car.