Try tightening your license plate. I know it sounds stupid but that is where half of all rattles come from. If that doesn't work, you need to buy some dynamat and insulating the parts that rattle (about $100 for about 6-10 square feet) Hope that helps Seth Ragona i have recently put two subwoofers in my trunk. I love them alot and they make the stereo sound great. However, the trunk rattles from them. Has anyone else had this problem, if so is there a cheap way to fix it?