Car audio modification subwoofer good?

Car stereo modification subwoofer good: 1, retrofitting subwoofer will not be harmful to the car but remember to never privately modify the circuit or will increase the chance of spontaneous combustion of the car; 2, therefore, it is still recommended to go to a professional store to find a professional master for modification, otherwise even if you have a very good sound modification after the effect is not necessarily very good may also have some security risks; 3, in fact, retrofit the subwoofer Or modify the sound is a lot of car enthusiasts like to do things to add a subwoofer and then listen to the music when the effect is better a lot of music enthusiasts will do this kind of modification.