Hey Spoon555,
There is roughly a 1/8th" gap on the short side and next to none along the long side of each pup. I knew this going in and was willing to accept it for the performance upgrade. Mark Brown did such a great job centering and installing the pups, that you can barely notice this unless you are right up looking directly at them. I think my 4401 looks significantly better with the Nords than the stock Barts, even with this very slight gap. I'd say go for it. Add a good quality pre (Sadowsky, Aguilar, Nordstrand, Audere) and the Nords of your choice and you will be quite pleased.