carstereoguide.com would be a decent three word .com, but I think the keyword order of your domain renders it worthless. Even something longer like guidetocarstereos.com would have better value IMO.
But This site already have 400 visit / month from google search and already made money from afliate
DA 26, TF 18 niche car stereo
4 years old
Estibot value 900 $