ok, Please dont hate on me for asking such questions, I am very new at this.. Ok, I have a 2005 Grand Prix supercharged with every option that was offered.. I have the nav sytem with onstar, suroof ect. ect. ect. ok, to the point.. I want t bad ass sound thumping system that will not take up little or any space in my trunk.. I have the nav sytem and love it, so I cant change that... I need some info on speakers, Amps, Subs.. anything that can get me started on this.. and again.. I would use a box but it has to be a small portion of my trunk,, I use this car with my wife and she shops in it sometimes..lol..I dont want to go to circuit city and pay out the arse.. that is how they do things... so tell me what I can do to get the best sound and hard hitting bass in this car.... thanks..... ps.. i am in houston texas