this last brouchure here shows a little info about the power the 4.1 turbo made compares the 4.1 turbo against a 351ci and normal 4.1 efi engine
PIC
http://www.xfalcon.com/modules/PNphp.../turbo_003.jpg
4.1 turbo had 530Nm and 190Kw straight out of the ford dealer which was very good by 1983 standards. Even these days they can tame an XR6turbo
and leave VL turbos for dead.
FEW PICS OF MY MACHINE xe esp turbo 4.1 and copy of 83 motor magazine
which did a road test on this car in 83