i went to some car audio place and they said sizes were 3 inches in the front and 3.5"s in the back.. iwas like wtf mate??? should i tell them they are novices? should i tell them to make 4" and 5" fit in the back? do we need to cut away the sponge? and lastly should the thing be re-wired? or should i use the same? i heard it was impossible to wire the system with the old wires.. i was confused.....and im going to stay with the becker headunit for now... is that wise? im not looking for loudness to be heard around the block.. just enough for the inside which is what i have right now. does JL makes sizes this small because i heard they were one of the best audio speakers... can i get enough for speakers for around $250??