hey i was wondering if i could change my speakers in my car without changing the amp or taking it out.. i was thinking of infinity refrence or if aftermarket speakers wont work then i was thinking can i use the speakers out of like an rsx type s with bose??

 

Just match the ohm rating, and try to get the rms as close as possible. I don't know how budgeted you are, but getting a nice 2 or 4 channel amp ... some front components, and rear fill if you like would very much improve your sound.