Well I would like to try the Quaife, but I see the issues about fitment, so I can get a used one from a manual and air freight to them and this month they have 20% off on Mercedes units. There is one for $75 in Miami and I could air ship to them in London so they could convert it. They would also know exactly what type/size is needed for the Crossfire. That is why I would need the weight so I can get the price from UPS.
I had a 74 Porsche 914 when I was in Med school, really tricked it out, great little Volkswagen. Well VW-Porsche magazine in the mid 80s did an article on putting a Quaife in a racing 914, no other mods to the car and it really helped on the lap times and they were really impressed with it. Said it is great in the curves.