Originally Posted by
massivewangers
This is dragging up and older post, but why the hell would you fit a FRST inlet manifold to an ST170 engine when it has a perfectly reasonable manifold from the factory? Or use the standard Focus 1.8/2.0 manifold if you prefer.
When factory Zetec inlets will work perfectly well, I can't understand why anyone would bodge on a manifold designed for a completely different engine, and yet people still seem to endlessly do it.
You can't use the standard ST170 inlet manifold for turbo charging, and the ports don't line up with a standard Zetec head, so no off the shelf inlet can fit/work properly
The FRST manifolds are used regularly as they solve issues with fuel rails basically as a custom fuel rail is needed to run top fed injectors on a Zetec inlet, which people don't want to go through the hassle of