For me it would actually get to 8000 and then the red light would stay on solid and it wouldn't go any faster. Definite rev limiter.
Oddly enough, if you were accelerating real fast, it would sorta get past 8k, and then 9-10k would be fine. So, it would suddenly cut out, and then kick back on again. Almost got away from me a couple times.
After putting the 15T back, I rode 100+ miles and not a single issue. Everything works as it should. Stupid Ducaca!!!