I know about a KA-T. I have one. But you need to do your own research. Go to KA-T.org. And for god's sake, don't post there. Just read.
And unless you or someone else swapped motors, your '89 has a KA24E, SOHC.
My website (in my sig) has info for a basic setup and what you'll be looking for and how much work to get turbo'd. And www.ka24development.com
-Jeff