Just asking as im about to buy a ZR celica and have plans to re - do the system. first things first - When i replace the factory deck, what do i do about the deck space that will be left? If you know celica's they have rather large factory stereos and after market ones are much slimmer. If i have to do some in filling, roughly how much will this cost & is it necessary to avoid things looking ugly? Also, the deck i am buying (pioneer) comes with bonus speakers, i wasn't originally planning on replacing the stock speakers but they are pioneer 180 watts 6 inch ones. Am i better off putting these in the front or rear? & will 6 inch fit in a 2000 model celica? All my equipment will be pioneer in order for it to match. So will a four channel amplifier with a 12 inch 1000 watt subwoofer work? Do i need a different amp with less or more channels? Is this an ideal system upgrade? (im on a budget) SO, we have - *Pioneer 200 watt CD tuner *Pioneer 2 way 6 inch speakers - 180 watt *Pioneer 600 watt 4 channel amp *Pioneer 12 inch 1000 watt sub All gonna cost me roughly 600 not including installation. If im going down the wrong path completely then please design a budget system for me! Cheers PS: I will be paying for professional installation