Just take a look inside of the car in the area where you plan on mounting the box outside and see if your screws will penentrate anything. You then should be ok. I ended up mounting my box inside the car on the passenger side up around where the air conditioning unit normally goes, keeps it quit a bit cooler inside. But I don't have a heater of air cond. unit in the way. I ended up making an aluminum mounting plate to attatch the box too to get it out from the fire wall for even more cooling, not that you need to go that far though, I just thought it looked cool and made it easy to take out if needed.