Great. Thanks for that link! I failed to find this a few months ago when I was looking. I am so glad to know that your research supports my decision not to fit the M45 I had available to my car :) You are right, M45 is not screw type (my bad).
In South Africa its fairly easy to get 2nd hand sc12's (people seem to only want to turbo the gze here) - but old SC12 units are getting scarce here now to. I prefer the drivable SC torque over the turbo route and prefer to be different anyway :)