If you have a good amp that doesn't get hot, its a great place. I have an orion cobalt 4 channel under the passanger seat and i don't think i'd want it anywhere else. Its hidden, so it doesn't look like I have a real system, and its not an easy smash and grab thing if they pop the trunk. I've had it under the seat in a contour for 5+ years now without any problems (was in my other contour that got totalled before the svt).
