Yes, I was one of the guys. Converted my Buddy Jochen´s trusty M03 to take a Spec-R gear diff. Car is still racing with that diff. Quite modern M03 now, even yesterday on the Podium on 3rd place during our autumn race. I did the conversion 2013, around 2015 I gave the car back to him to race in our Mini series. Not even a Little problem since the built in. It takes a Carson 16t Dragster set in the meantime, had to modify the rear section a little to hide the big ESC in the back for grip and lower COG. Jochen also spent some money on a set of Big Bore dampers with the black springs. Still a great car, after all these years. Oh, forgot that it also uses double CVD´s from Tamiya, too.

Greats to Norway,
Matthias