you'll have doubts and won't be a believer until you finally put dynamat in your vehicle. if you have a good stereo in your car/truck, putting dynamat in will make it sound like you added another subwoofer in. it helps with rattles and helps with road noise as well. every system i install, i always put dynamat in, unless the customer doesn't want to spend the money. it's WELL worth it though and the only way to prove it is to listen to your system before and after.