Do a search for conversion stuff. It seems like someone asks about this every week. In short, if you want to put make a SyTy clone out of your regular S truck, you're basically going to be buying a whole SyTy engine. I think it's been said that a supercharger is the way to go if you just want some bolt-on performance.
FYI, the Sy and Ty have different exhausts. The Sy's is dual behind the cat, which is just extra weight. Most people go with the ATR kit for a near-stock system.