Agree with warranty void. Read carefully on term and condition. I agree that is cheaper if you go on vacation and buy it. As long as you get pass the custom without tax that will be great. And plus have to handle with care, coz if the amp get faulty, I would say sorry.

I meet people take back from Aust, amp and woofer of JL audio in super low price by pass custom. He said 1 thing "hand carry like hell~!" But no more warranty.

So the risk is there, you decide to take it or not.

Tax is 3+1 if not mistake. Just add on another 40% to your total declaration price. Some item you will find worthy. The person I meet was hand carry with very low tax as used item. He used to study there. Even after convert still found very worth. The price include tax and conversion is like RM4k, the item selling here is RM7k.
There's never easy get pass custom.

Tax for electronic product is 40% on declared price. So since your fren bringing, negociate with the vendor to get a cheaper resit, can save some on that. Amp sure taxable. Since your fren carry so, no need buy insurance on it.
Also don't forget the installation charges, unless you install yourself.