I think it is great u have released ceramic bearings for the RB .21's, I found this to be the only place the RB engines were lacking in. With the addition of the new ceramic main bearing in the Xenon-R and some port matching, I think it is the best, most powerful .21 on-road engine on the market today.
Will u be releasing a ceramic bearings for any of the RB .12? I think a ceramic main bearing for the Matrix RW would be excellent.
Also just a note to all of u that have RB engines. If u want the best power, fuel economy from it use the RB pipe that is recommended for it. No pipe will work better on an RB than an RB.