Let me see, if you are really interested to spend around 4k to 5k. I can get it for you within budget.

2 set Mb quart Premium PCE - 216

2 JL audio 12" subwoofer 12W3v2 D4

1 double subwoofer full pvc 6mm box

1 Lanzar Vibe X8 Electronic Crossover

1 SP Audio U.S.A 4 Channel 440Watt RMS Mosfet Amplifier

1 SP Audio U.S.A 1000Watt Monoblock Amplifier (mainly for subwoofer 600 to 800W RMS)

Including installation, all wirring and RCA cable and fuse and tunning.
I can get it for RM3999

As for the Head Unit, i recommend u to get alpine. For that you will need to find it yourself

I got friends getting tax free product on all this. If you count it as market price it will be around RM15K.

I also spend around 4k to 5k on my car with all this product, it has proven 100% original, not those imitation china products. Onces u hear the sound, u will tell it urself.

Interested send me an email at justice_wong@hotmail.com

Just sharring with u

I got plenty of friends playing audio system. Haha~

Most of them are very well known specialist