A weak car stereo system is embarrassing and frustrating, but it can be conquered with a quality amp. Even more impressive is saving money by purchasing a quality used amp to update an aging stereo. Honda used parts are not just under the chassis or the hood. Used Honda parts include such sound system upgrades as amps, equalizers and speakers. The part does not have to be new to increase the quality and power of the sound produced. A Honda used amp can quickly, and inexpensively, produce superior results from a previously inferior system.