I just install a Double Din HU in my car recently.The shop guy tel me to install a relay with it for better performance.The relay is very expensive as RM100++.What is the relay function for the audio system in our car?
in some cases, a relay are used to direct another better source of current to a system, but if install a headunit must add in relay is just a gimmick. unless you got some special mod on ur system. Find a good installer and you are saved from these marketing stuffs......
I had used a machine to polished my black car, but end up when under the sun i saw alot of swirl and it disaster. anything can help to restore back in lower budget type instead of sending to detailing shop
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