Originally Posted by ZAHANMA

You could technically go lower than 64mm, but it wouldn't be from turning down the current design. It would involve a new design, which had a new, smaller bearing which could still maintain the high RPMs of the supercharger while at the same time being smaller in diameter around the input shaft of the supercharger.

So it is technically possible, but with this engine no longer in production and most companies switching to turbo setups, seems like it will not be something that would ever come to fruition.

Heck, even EC said that once the second batch of S/C pullies is gone, they will not be producing or selling any more of them.