Unfortunatlely, it seems like a trait of the Nosram/LRP brushless, so all you can do is put up with it.
You can do all you can with regards to gearbox noise, pinion noise - by checking it all, and making sure the pinion/spur is in good condition etc, then there are the outdrives and dogbones which may be worn and rattle...
But even when all is perfect, it'll still make an aweful noise.
But, on the other hand, Novak motors are much quiter. Mine (6.5R) screams like a 10x2 in my X-6, so you may want to try replacing motors? I know it'll work fine with your Matrix ESC.
Chris
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