I tried this. It does make it quieter for awhile. I'd estimate about 500 miles before the noise returns.
The Additive will eventually wear out just like the oil does. Mainly due to the sheer loads in the transmission.
I went a step further and tried the Lucas 4T Oil, both 10W-40 and the 20W-50 + the stablizer (All full synthetic).
Within 3000 miles, the oil was a little better than the Rotilla T6, but the noise was still there.
The only way I've figured out how to minimize the noise, is to adjust the valves to the tightest allowable specs, IN 0.003"/Ex 0.007". At this tight, they don't make as much noise and the bike runs at it's best. However, your exhaust valves will need to be adjusted almost every 4000 miles. Because of this, I put up with th noise and adjust the valves to the maximums, In 0.005"/Ex 0.009". This way i don't have to adjust them for about 10k miles.
Two things, ...
1- the noise seems to go away after about 10min on the freeway once the bike has heated up.
2- When the bike needs topped off, I use the Lucas 20W-50 full synthetic to help replace maintain it's weight.
Using the Oil stablizer cost too much and doesn't work any better.