Like has already been said, an RS2000 doesn't have a zetec, it has a I4 engine. Used to piss me right off when people used to try to tell me when I had one, that my engine was a zetec, second only to people asking if it was a GTi

I have heard good things about turbo'ing a rs2000 engine, well, using a 2.3 I4 bottom end out of a galaxy with low comp pistons, and an RS2000 head with a blower strapped on. But, for an RST it's probably too heavy, and too costly to fit it.

As said go for the ZVH or the full Zetec turbo Here's a good guide to DIY'ing a ZVH: http://www.quantums.info/zvh.htm

Lee