I have to admit, I'm a little skeptical of this mod being a "major" improvement.
I mean seriously, widening the car by 4mm is not much at all IMO, and I whilst I think it would make some difference, it is not going to be a huge change.
For those who use the kit Kyosho rear wheels, surely you could just add spacers between the wheel and the hex-mount like they do with the touring cars ?
The internal hex on the inside of the standard wheel is deep enough to allow you to add at least a 1mm spacer per side - a much cheaper option at least
