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 plan to go with S90 @ 70mm throttle body and aftermarket aluminium intake manifold to match with my Deratech cam.
Meanwhile, is upgrade on air flow meter is necessary?
If needed, what is the air flow code number is good to upgrade?
Also, changing in bigger air flow meter will make the engine run lean ?
Please advise and educate... Thx.
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