just to give you some idea on wheel weights in 18x 8.5(7.5kg) and 18x11(9kg)
pretty good saving I would say in the right place and obivously a stronger forged wheel weight distribution across the whole wheel is key too I bet there was hardly any balancing weights that had to be added?
Wopps trainers got to be some Ken Block DC shoes then lol
Different offset for the GTR, but we will certainly be fitting them to ours as an when we get it.
Amount of wheel weights depends a lot on the tyres, slicks for example tend to need a lot less but road tyres can be pretty variable.