I have rattled off screws in my back seat, bolts holding my license plate on, and countless other small parts in my car. I am running over 2000 watts RMS and when it hits, it will nearly kick the trunk open. I had to replace the latch on the trunk cause the bass messed up the old one to the point it would not close. So in short, you will mess some stuff up, but not unless you got lots of power (RMS, not the bs peak wattage figures listed on some cheap amps..... ie sony). But its all minor, so go for it.