Answer to above question. As long as you describe your item as electronics item you wont be taxed.(for car audio after all its a audio system, just dont mention the word car)

Second you may use better shipping (DHL/FedEX) they have their own clearance agent. In order to meet fast delivery deadline they will clear your item fast. in this process item get away tax most of the time.

From my experience I have bought stuffs over RM30k, few time got tax due to I had lather purse/shoes/jacket. Other than that never.

As my signature says, if you are planning to by from US let me know, i may be able to help.

thanks,
Sena