..or tune the cvt to control all that...
..i'm just sayin'...
When the CVT is fully geared out, the RPM will rise to the restricted maximum or until the power cant drag the RPM further out. So if he keeps his throttle turned after hitting max gearing in the CVT, his RPM will rise.
For example: during accelleration, my rpm are stable at around 7200 because of worn down 6,2g rollers but it will still hit the restriction at 9000 rpm, when the CVT is fully geared. The sound of fuel getting dumped directly into the exhaust is even more obvious with my Leo Vince, as it havent got the silencing zig-zags as the standart has.
I will make a video soon if i remember it, but i fear that the cellphone microphone won't catch the sound properly. :p
This is how i've learned to read a popping sound in the exhaust: "It's not healthy for the engine, but it is a sign that the maximum has been reached and it is time to let go of the throttle, as it won't go any faster."
It can also be read as: "It has got the power to drag it all the way up here, so it problably has the power to drag a higher gearing, and then it will possibly find a decent level gearing in the CVT, at the point that it has the power to drag it up to."
Both these ways will be better for the engine than hitting the restriction or removing it completly