Im planning add a sound system in my MS3. i do not have the bose HU and speakers. i got all the component including rca converter output(im keeping the stock HU), 600watt 2channel amp, 2x400watt subs,power and ground wires, amp turn on wire. the way how i do is run the the rca converter output and tap into speaker wires behind the stock HU and plug into aftermarket amp, i heard u wont get most power out from speaker wires behing the stock HU with the rca converter output.this way is kinda difficult to me, cause i need lots wires to run this does anybody know the other way to do it?? or this is the best way if u keeping the stock HU..???any helps and pics will be greatly appreciated..!!!!!