Upgrading a car stereo system is as easy as adding an amplifier. And the best way to ensure that the system will provide the power and quality is to buy a used amplifier. Using the best components means that a used Honda part may be the best option. It can be expensive, as everyone knows, to build the best sound out of the best parts. Using Honda used amplifier means that the parts will be the best while also saving the buyer some money on the overall price.