Hi TomMog,
I recently helped a friend mount the Mulfab radiator on his sigma sport 4/4.
I can confirm the high quality of the product, compared to the original radiator.
I think I will order one soon, but that I will have it delivered to my B&B where I am staying near Goodwood, it will avoid the 30% import tax in Europe...
Below is the story of our assembly:
http://www.talkmorgan.com/ubbthreads.php/topics/769378/1