I'll be taking my car on the rollers in a couple of weeks with for a before and after session with my new plenum: http://www.g2.nu/chris/westie/pictures/20040213/

It's set up to allow you to swap over from standard as easily as possible so has bosses for 2WD/4WD/escort/sierra fuel rails and takes the standard TB.

You'll note that the design is tapered and has an extention at the far end to ensure that it gets optimum balance between cylinders. The other thing that this design does is allow you to flip the plenum round so that you can mount the TB at the rear, which is something that people want to do in a number of installs where space is limited. It has also been designed for 8 injector setups, you just need to add a fuel rail and injectors.

If all proceeds to plan then I'm hoping to do a small production run of them so if you're interested let me know and I'll keep you posted on developments.