I have an 07 gmc sierra crew cab with busted speakers. I want a new cd player and just 2 speakers (i think thats all i need, ddint think i would really need all 4) for under $600. Ive already got an amp and i just want it to sound really good. My questions are, if i get this, is there a way to turn volume up from steering wheel after being replaced? Any suggestions would be appreciated!