I'm trying to replace the factory speakers and head unit in a 1997 318ti. I'm pretty sure that it's factory amplified so I'm going to have to replace everything. I don't know too much about car audio, but I was thinking about getting new speakers, an amp, and a fresh head unit for the car. I'm not looking to have the loudest thing out there or the best sounding system, just something to give me good clean sound for not too much money. Here's what I was looking at: 5-1/4 (front): http://www.crutchfield.com/p_107DB52...521.html?tp=97 6-1/2 (rear): http://www.crutchfield.com/p_130TSA6...43P.html?tp=95 Amp I remember hearing something about having a channel for each speaker, so would something like this do well for the amp? (I had an alpine in the past and loved it): http://www.crutchfield.com/p_500MRPF...00.html?tp=115 Head unit I'm not sure about the head unit because I'm not sure how many pre-outs I need. Down the road I may decide to put a sub in with it's own amp so how many pre-outs should I get?