cause its a preferece. i want the adjustabilty. i run 15" daily at times might run 14" on the track will run 13" not that its a big deal. with springs if its not dropped enough you are stuck unless you cut them then you may greatly sacrifice your ride quality, also if its dropped too much you definately are stuck. now with coilovers you can adjust to your desire. one thing now i see that the omni-powers full coilover setup are made for 92 and up will seach and see if they are made for my 91. if not guess its onmi-power slip ons and koni yellows. remember when i priced them they are only off by a few dollars.