Yup, this
http://www2.towerhobbies.com/cgi-bin...?&I=LXBEF4&P=7 is the motor I have.
I already ground down the chassis and the motor is in, but now I still need to modify motor mount. I attached a pic for those not clear on why, notice the bearing for the motor hitting the edge of the motor mount's circular opening for the bearing to stick through. Unless I widen the hole, I'm stuck with 10T or smaller pinions (on my 42T spur).
I test ran the motor when I got it and you're absolutely right, the motor is super silent, silky smooth and just plain fast. I ran it with the 10T/42T combo.
Out of curiousity, how does this motor compare to something like a 280, 300 or any of the larger MRS4 motors?