I know I'm bumping an old thread of my own but I'm still considering this idea of going IB as I cannot find a sub setup for my trunk I can live with. If it wasn't for the fact I leave my seats down during the summer to haul wakeboards, I wouldn't have this problem. And if I didn't just blow a tire a couple weeks back, I'd just do a false floor and be done. Ugh! So I'm back to the 3-8" idea off 300w. That is unless someone can give me an idea to put my amps which take up too much square footage........ for a small coupe. Any new ideas?