Think its 163 for the base, 166 for the HP, which is odd. Not sure why 3MPH matter. I also have not heard about the PPL2 having a different limiter than the GT or PPL1 but it should have more stability than the Bullitt which is 163 limited.
The whole limiter thing is an odd scam. We know a Bullitt can do over 170MPH. The Mach1 base, HP and GT PPL2 likely can all do the same.