Inside the trim on the LHS of the boot there is a fair bit of space as the little storage pocket actually unclips from the back of the trim and there is more room either side and below it so you could probably hide an amp in there no probs you would just need to fabricate a bracket for it and if you were using fibreglass and were ok with the box coming out as far as the strut you could build a reasonable size box for a single sub as well